周期
周期 30초 만에
- 周期 (shuuki) means 'period' or 'cycle' in Japanese.
- It refers to the time it takes for a repeating event to complete one full loop.
- It is commonly used in science, medicine, economics, and for regular routines.
- It is a formal noun and can be turned into an adverb with '的に' (shuuki-teki ni).
The Japanese word 周期 (しゅうき - shuuki) is a fundamental noun that translates most directly to 'period' or 'cycle' in English. It represents the time interval required for a recurring event or phenomenon to complete one full sequence and return to its starting state. Unlike general words for 'time' or 'duration,' 周期 specifically implies a repetitive, rhythmic, or predictable nature. It is an essential term in both everyday conversation and specialized fields such as science, medicine, and economics.
- Scientific Context
- In physics and mathematics, it refers to the duration of one complete wave or oscillation. For example, the movement of a pendulum or the rotation of a planet.
地球の自転の周期は約24時間です。(The period of the Earth's rotation is approximately 24 hours.)
- Biological Context
- It is used to describe biological rhythms, such as the menstrual cycle (生理の周期), sleep cycles (睡眠周期), or the life cycle of plants and insects.
The word is composed of two kanji characters: 周 (shu), meaning 'circumference,' 'circuit,' or 'to go around,' and 期 (ki), meaning 'period,' 'time,' or 'expectation.' Together, they literally translate to 'the time it takes to go around once.' This visual imagery helps learners understand that 周期 is not just any length of time, but a duration that leads back to the beginning. Whether you are talking about the seasons changing, the ticking of a clock, or the repetitive nature of historical events, 周期 is the go-to word. It is more formal than the katakana word サイクル (saikuru), though they are often interchangeable in casual speech. Using 周期 adds a layer of precision and academic weight to your Japanese.
この機械は一定の周期で音を鳴らします。(This machine makes a sound at a fixed interval/cycle.)
- Economic/Social Context
- Used to describe trends that repeat over years or decades, such as fashion trends or economic booms and busts.
Understanding 周期 allows you to discuss complex topics like climate change (the cycle of ice ages), technology (product update cycles), and even personal habits. It is a bridge between conversational Japanese and academic or professional Japanese. When you see this word, think of a circle closing—a process that repeats itself over and over. This conceptual understanding will prevent you from confusing it with 期間 (kikan), which refers to a simple duration or period of time without the implication of repetition.
Using 周期 correctly involves understanding its role as a noun and how it interacts with particles and verbs. Most commonly, it acts as the subject or object of a sentence, or as part of a compound noun. Let's explore the grammatical patterns and common pairings that will make your Japanese sound natural and professional.
- Pattern: [Noun] + の + 周期
- This is the most common way to specify what kind of cycle you are talking about. Examples: 睡眠の周期 (sleep cycle), 景気の周期 (economic cycle), 太陽の活動周期 (solar activity cycle).
ハレー彗星の回帰周期は約76年です。(The return cycle of Halley's Comet is about 76 years.)
- Pattern: 周期 + が + [Adjective]
- Common adjectives used with 周期 include 長い (nagai - long), 短い (mijikai - short), 正確な (seikaku na - accurate), and 不規則な (fukisoku na - irregular).
In more advanced contexts, you will encounter 周期 as a prefix or suffix in technical terms. For instance, 周期律表 (shuuki-ritsu-hyou) is the Periodic Table of Elements. Understanding the 'cycle' meaning makes these difficult terms much easier to remember. When describing frequency in a more adverbial sense, you can use '一定の周期で' (ittei no shuuki de), which means 'at regular intervals' or 'at a fixed cycle.'
最近、睡眠の周期が乱れていて、疲れが取れません。(Lately, my sleep cycle has been disrupted, and I can't get rid of my fatigue.)
- Verbs commonly used with 周期
- 繰り返す (kurikaesu - to repeat), 計算する (keisan suru - to calculate), 測定する (sokutei suru - to measure), 把握する (haaku suru - to grasp/understand).
When writing, 周期 is often used to establish the pace of a narrative or a scientific observation. It provides a structured way to look at time. For English speakers, it is helpful to contrast 周期 with 'frequency' (周波数 - shuuhasuu). While frequency measures how *often* something happens per unit of time, 周期 measures the *time* it takes for one occurrence. They are inverse concepts. By mastering 周期, you gain the ability to describe the rhythms of life, nature, and technology with the precision of a native speaker.
You will encounter 周期 in a wide variety of real-world Japanese environments. Its versatility means it shifts from the doctor's office to the stock market news effortlessly. Recognizing where it appears will help you tune your ears to its usage.
- In the Media and News
- News reports on the economy frequently use 景気周期 (business cycle). You might hear: '景気周期の波を予測するのは難しい' (It is difficult to predict the waves of the business cycle).
気象庁は、エルニーニョ現象の発生周期を調査しています。(The Meteorological Agency is investigating the occurrence cycle of the El Niño phenomenon.)
- In Medical and Health Settings
- When visiting a pharmacy or clinic, 周期 is used to discuss biological functions. A pharmacist might ask about a 'menstrual cycle' (生理周期) or a doctor might explain 'cell division cycles' (細胞分裂の周期).
In the classroom or in educational documentaries (like those on NHK), 周期 is used to explain the orbits of planets, the vibration of strings in music, or the periodic table in chemistry. It is a 'hard' word—one that signifies factual, reliable information. In sports, coaches might talk about a 'training cycle' (トレーニング周期) to prepare athletes for major competitions. Even in tech, the 'update cycle' (更新周期) of software or hardware is a common topic of discussion among enthusiasts.
この製品の買い替え周期は、平均して3年です。(The replacement cycle for this product is three years on average.)
- In Everyday Conversation
- While slightly formal, people use it to talk about their routines or habits that repeat. '掃除の周期' (cleaning cycle/schedule) or '美容院に行く周期' (the frequency of going to the hair salon).
By paying attention to these contexts, you'll see that 周期 is not just a vocabulary word but a tool for organizing how we perceive the world's repeating patterns. Whether it's the macro-level of the universe or the micro-level of your own skin cells, 周期 is the word that ties it all together.
While 周期 is a straightforward concept, learners often trip up by using it in place of other time-related words. Understanding these nuances is key to reaching B1 and B2 proficiency levels.
- Mistake 1: Confusing 周期 with 期間 (kikan)
- 期間 refers to a simple duration of time—a 'period' from point A to point B. 周期 implies that after point B, the process starts again at point A. If you are talking about a vacation that lasts 10 days, use 期間. If you are talking about a vacation you take *every* 10 months, you could discuss the 周期.
❌ このプロジェクトの周期は3ヶ月です。
✅ このプロジェクトの期間は3ヶ月です。(The project duration is 3 months.)
- Mistake 2: Overusing 周期 when 頻度 (hindo) is better
- 頻度 means 'frequency' in the sense of how often something happens. While 周期 is the *time* between events, 頻度 is the *count* of events. If you want to say 'He exercises frequently,' use 頻度 (頻度が高い). If you want to say 'He exercises every 3 days,' you are describing the 周期.
Another mistake is forgetting that 周期 is a noun. Learners sometimes try to use it as a verb directly. Unlike words like 勉強 (benkyou), you cannot say '周期する.' Instead, you must say '周期的に繰り返す' (to repeat periodically) or '周期を持つ' (to have a cycle). In technical writing, ensure you don't confuse 周期 (period) with 周波数 (frequency). In physics, period (T) is the time for one cycle, and frequency (f) is cycles per second. Using them interchangeably will lead to confusion in scientific contexts.
❌ 周期が早いです。
✅ 周期が短いです。(The cycle is short.)
Finally, be careful with the kanji. 周 (shu) is often confused with 週 (shu - week). While they sound the same, their meanings are distinct. A 'weekly cycle' would be 毎週の周期, but don't accidentally write 週記 (which would mean a weekly diary)! Keeping the visual of a circle (周) in mind will help you keep the meaning and the kanji straight.
Japanese has several words that overlap with 周期. Choosing the right one depends on the level of formality and the specific nuance you want to convey.
- サイクル (Saikuru)
- This is the katakana version of 'cycle.' It is used frequently in casual conversation, marketing, and modern business. It feels lighter and less 'scientific' than 周期. You'll hear 'ライフサイクル' (life cycle) or 'リサイクル' (recycle).
- 循環 (Junkan)
- This means 'circulation' or 'rotation.' While 周期 focuses on the *time* it takes to repeat, 循環 focuses on the *flow* or the act of moving in a circle. Example: 血液の循環 (blood circulation).
- 期間 (Kikan)
- As mentioned before, this is 'duration.' It describes the length of time between two points without any implication that the event will repeat. Use this for deadlines, vacations, or fixed stages of life.
Comparison:
周期: The rhythm/timing of repetition.
循環: The movement/flow in a circle.
期間: The static length of time.
- 頻度 (Hindo)
- Frequency. Use this when you are counting how many times something happens in a given timeframe. '更新の頻度が高い' (The frequency of updates is high).
Another related term is 恒例 (kourei), which means 'established custom' or 'annual event.' While an annual event has a 周期 of one year, 恒例 emphasizes the tradition and the expectation that it will happen, rather than the mathematical timing. Similarly, 輪廻 (rinne) is a Buddhist term for the cycle of rebirth (Samsara). While it describes a cycle, it is strictly religious and spiritual. By knowing these alternatives, you can tailor your Japanese to fit the exact context, whether you're explaining a physics experiment or talking about your favorite annual festival.
How Formal Is It?
재미있는 사실
The word 周期 was essential for the modernization of Japanese science in the Meiji era, as scholars needed a precise translation for the Western concept of 'period' in physics and chemistry.
발음 가이드
- Pronouncing it as 'shuki' (short u) instead of 'shuuki' (long u).
- Confusing the pitch accent with 'shuki' (meaning 'memorandum').
- Pronouncing 'ki' like 'key' in English (keep it shorter in Japanese).
- Adding a stress on the second syllable.
- Mixing it up with 'shuku' (celebration).
난이도
The kanji are N3 level, but the concept is easy to grasp.
Both kanji have several strokes and require practice to write neatly.
Easy to pronounce if you remember the long 'uu' sound.
Can be confused with other 'shuu' words if context isn't clear.
다음에 무엇을 배울까
선수 학습
다음에 배울 것
고급
알아야 할 문법
Using ~的に to form adverbs
周期 + 的に = 周期的に (periodically)
Noun + の + Noun
睡眠の周期 (sleep cycle)
Using ~ごとに for intervals
一週間ごとに (every one week - related to cycle)
Intransitive verb 'midareru'
周期が乱れる (The cycle is disrupted)
Causal 'no eikyou de'
景気周期の影響で (Due to the influence of the business cycle)
수준별 예문
月の周期は一ヶ月です。
The moon's cycle is one month.
Simple [Noun] + の + [Noun] structure.
この時計の周期は正しいです。
This clock's period/cycle is correct.
Using 'tadashii' (correct) to describe the cycle.
花の周期を知りたいです。
I want to know the cycle of the flowers.
Using 'tai' to express desire.
短い周期で雨が降ります。
It rains in short cycles.
Using 'de' to indicate the manner/interval.
周期的な音を聞きました。
I heard a periodic sound.
Using 'teki na' to turn the noun into an adjective.
一年の周期は四季があります。
The one-year cycle has four seasons.
Describing the contents of a cycle.
信号の周期が変わりました。
The traffic light cycle changed.
Using 'kawaru' (to change) as an intransitive verb.
周期を数えてください。
Please count the cycles.
Using 'kudasai' for a polite request.
健康のために、睡眠の周期を整えましょう。
Let's fix our sleep cycle for our health.
Using 'tame ni' (for the sake of) and 'mashou' (let's).
この植物は、長い周期で花が咲きます。
This plant blooms in long cycles.
Using 'de' to show the interval of the action.
機械が一定の周期で動いています。
The machine is moving at a fixed cycle.
Using 'ittei no' (fixed/constant).
掃除の周期を決めると楽ですよ。
It's easier if you decide on a cleaning cycle.
Using 'to' to show a condition and result.
星の動く周期を勉強しました。
I studied the cycle of moving stars.
Using a verb phrase to modify 'shuuki'.
このアプリで生理の周期を記録します。
I record my menstrual cycle with this app.
Using 'de' for the tool/instrument.
波の周期が早くなっています。
The period of the waves is becoming faster (shorter).
Using 'naru' to show a change in state.
周期が乱れると大変です。
It's difficult when the cycle is disrupted.
Using 'midareru' (to be disrupted).
景気周期の影響で、売上が落ちています。
Due to the influence of the business cycle, sales are falling.
Using 'no eikyou de' (due to the influence of).
この薬は、24時間の周期で服用してください。
Please take this medicine on a 24-hour cycle.
Using 'de' for the interval.
太陽の活動には約11年の周期がある。
There is a cycle of about 11 years in solar activity.
Using 'ni wa ... ga aru' to show existence.
彼は周期的に日本を訪れる。
He visits Japan periodically.
Using 'teki ni' as an adverb.
ファッションの流行には一定の周期があると言われている。
It is said that there is a certain cycle in fashion trends.
Using 'to iwarete iru' (it is said that).
細胞が分裂する周期を観察する。
Observe the cycle at which cells divide.
Direct object 'shuuki' with the verb 'kansatsu suru'.
その彗星は非常に長い周期で地球に近づく。
That comet approaches Earth in a very long cycle.
Using 'hijou ni' (extremely) to modify the adjective.
生活の周期をリセットする必要があります。
It is necessary to reset your lifestyle cycle.
Using 'hitsuyou ga aru' (there is a need).
エンジンの振動周期を計測して、異常を検知する。
Measure the vibration period of the engine to detect abnormalities.
Using 'te' form to connect actions.
歴史は、似たような周期を繰り返しているように見える。
History seems to be repeating similar cycles.
Using 'you ni mieru' (seems to be).
この島では、火山の噴火周期が約50年だと推測されている。
On this island, it is estimated that the volcanic eruption cycle is about 50 years.
Using 'to suisoku sarete iru' (is estimated that).
睡眠周期が乱れると、精神的な健康にも悪影響を及ぼす。
If the sleep cycle is disrupted, it also has a negative effect on mental health.
Using 'akueikyou o oyobosu' (to exert a bad influence).
在庫の回転周期を短縮することで、利益を上げる。
Increase profits by shortening the inventory turnover cycle.
Using 'koto de' to show the means/method.
周期律表は、化学を学ぶ上で最も重要なツールの一つだ。
The Periodic Table is one of the most important tools in learning chemistry.
Using 'ue de' (in the process of/when).
心拍の周期をモニターで確認してください。
Please check the heartbeat period on the monitor.
Compound noun 'shinpaku no shuuki'.
不規則な生活が続くと、ホルモンバランスの周期が崩れる。
If an irregular lifestyle continues, the cycle of hormonal balance collapses.
Using 'to' for a natural consequence.
マクロ経済学では、景気循環の周期性を分析することが不可欠だ。
In macroeconomics, analyzing the periodicity of the business cycle is essential.
Using 'fukaketsu da' (is indispensable/essential).
この振り子の周期は、紐の長さによって決定される。
The period of this pendulum is determined by the length of the string.
Using 'ni yotte kettei sareru' (is determined by).
独自の周期を持つ複数の波が重なり合い、複雑な干渉を引き起こす。
Multiple waves with their own periods overlap, causing complex interference.
Using 'kasanariai' (overlapping) and 'hikioikosu' (to cause).
生物の体内時計は、24時間周期のサーカディアンリズムを刻んでいる。
The biological clock of living things ticks with a 24-hour circadian rhythm cycle.
Using 'o kizande iru' (is ticking/carving).
その国家の政治的混乱は、10年周期で再燃する傾向にある。
The political turmoil of that nation tends to flare up again in 10-year cycles.
Using 'keikou ni aru' (have a tendency to).
デジタル信号のサンプリング周期を適切に設定する必要がある。
It is necessary to appropriately set the sampling period of the digital signal.
Using 'tekisetsu ni' (appropriately).
太陽黒点の数は、約11年周期で増減を繰り返している。
The number of sunspots repeats an increase and decrease in a cycle of about 11 years.
Using 'zougen o kurikaesu' (repeat increase and decrease).
伝統的な祭りは、共同体の結束を強める周期的な儀式としての役割を果たす。
Traditional festivals play a role as periodic rituals that strengthen community bonds.
Using 'yakuwari o hatasu' (to play a role).
ニーチェの『永劫回帰』の思想は、宇宙が無限の周期で繰り返されるという仮説に基づいている。
Nietzsche's idea of 'Eternal Recurrence' is based on the hypothesis that the universe repeats in infinite cycles.
Using 'ni motozuite iru' (is based on).
量子力学における波動関数の周期性は、物質の性質を規定する根源的な要素である。
The periodicity of the wave function in quantum mechanics is a fundamental element that prescribes the properties of matter.
Using 'kongenteki na youso' (fundamental element).
文明の興亡には、ある種の不可避な周期が存在するという歴史観がある。
There is a view of history that a certain kind of inevitable cycle exists in the rise and fall of civilizations.
Using 'fukahi na' (inevitable).
経済学における長期的波動の周期を同定することは、実証的な課題として残されている。
Identifying the cycle of long-term waves in economics remains an empirical challenge.
Using 'doutei suru' (to identify) and 'jisshouteki' (empirical).
言語の変遷にも周期的なパターンが見出せると主張する言語学者もいる。
Some linguists argue that periodic patterns can be found in the transition of languages.
Using 'miidaseru' (can find/discover).
その芸術家の作品群には、破壊と創造が周期的に交錯するテーマが一貫して流れている。
In the artist's body of work, a theme in which destruction and creation periodically intersect flows consistently.
Using 'kousaku suru' (to intersect/cross).
気候変動の周期的な変動要因を解明することは、未来予測の精度を高める鍵となる。
Elucidating the periodic fluctuating factors of climate change is the key to increasing the accuracy of future predictions.
Using 'kaimei suru' (to elucidate/clarify).
社会的な価値観の変容は、世代交代の周期と密接に連動している。
The transformation of social values is closely linked to the cycle of generational change.
Using 'missetsu ni rendou shite iru' (is closely linked/interlocked).
자주 쓰는 조합
자주 쓰는 구문
— When two cycles synchronize or match up.
二つの波の周期が合う。
— To make the cycle complete faster.
更新の周期を早める。
— To slow down the cycle.
支払い周期を遅らせる。
— Completing one full cycle.
周期が一巡した。
— Calculating the period.
周期計算を行う。
— Predicting the next cycle.
地震の周期予測。
— A graph showing cycles.
周期グラフを作成する。
— An error in a rhythmic process.
周期エラーが発生した。
— Periodic inspection.
エレベーターの周期点検。
— Setting the interval/cycle.
タイマーの周期設定。
자주 혼동되는 단어
Kikan is a one-time duration. Shuuki is a repeating interval.
Hindo is how many times (frequency). Shuuki is the time between those times (period).
Shuuki (weekly diary) sounds the same but is written with different kanji and used differently.
관용어 및 표현
— History repeats itself. While not using the word '周期,' it describes the concept perfectly.
歴史は繰り返すと言うが、まさにその周期だ。
General— The seven-year itch. A cultural idea that relationships have a cycle of trouble every seven years.
これも一種の周期かもしれない。
Casual— Giving up after three days. Often used when someone's 'good habit cycle' breaks immediately.
ダイエットの周期が三日で終わった。
Informal— To have ups and downs. Describes a cycle of performance or mood.
彼の成績には周期的な波がある。
Neutral— Coming full circle. Describes a long and indirect cycle.
巡り巡って、また同じ場所に戻った。
General— One full cycle (often 12 years in the zodiac).
彼は私より一回り(12歳)年上だ。
General— The cycle of death and rebirth.
輪廻の周期から解き放たれる。
Religious— Retributive justice; what goes around comes around.
悪い行いの周期が自分に返ってきた。
Formal— Perseverance will be rewarded. Implies a three-year cycle of effort.
修行の周期として三年は必要だ。
General— The prosperous must decline. Describes the inevitable cycle of power.
歴史の周期、盛者必衰の理だ。
Literary혼동하기 쉬운
Both involve circles.
Shuuki is about the *time* of the cycle. Junkan is about the *movement/flow* of the cycle.
血液の循環 (blood circulation) vs 睡眠の周期 (sleep cycle).
They mean the same thing.
Saikuru is loanword/casual. Shuuki is native/formal.
仕事のサイクル vs 景気周期.
Both used in physics.
Shuuhasuu is cycles per second (Hz). Shuuki is seconds per cycle.
この電波の周波数は高い。
Both mean 'periodic'.
Teikiteki is an adjective describing something scheduled. Shuuki is the noun for the interval itself.
定期的な点検 vs 点検の周期.
Related to frequency.
Kaisu is the count (number of times). Shuuki is the time interval.
練習の回数を増やす。
문장 패턴
[Noun] の周期は [Time] です。
月の周期は28日です。
[Noun] は周期的に [Verb]。
この機械は周期的に止まります。
周期が [Adjective] です。
最近、睡眠の周期が短いです。
一定の周期で [Verb] ことが重要だ。
一定の周期でバックアップを取ることが重要だ。
[Noun] の周期が乱れると、[Result]。
ホルモンの周期が乱れると、体調が悪くなる。
[Noun] には周期性が見られる。
このデータには明確な周期性が見られる。
[Noun] の周期を同定する。
景気変動の周期を同定する。
[Concept] は [Noun] の周期と密接に連動している。
社会の変容は経済の周期と密接に連動している。
어휘 가족
명사
동사
형용사
관련
사용법
Highly common in news, science, and health contexts. Moderate in daily casual speech.
-
Using 周期 for a one-time duration.
→
期間 (kikan)
周期 is only for things that repeat. If you say 'the duration of the movie is 2 hours,' use 期間.
-
Saying 周期が早い (shuuki ga hayai).
→
周期が短い (shuuki ga mijikai)
While 'fast' makes sense in English, in Japanese, we describe the length of the time interval as 'short'.
-
Writing 週記 (weekly record) instead of 周期.
→
周期
These are homophones. Make sure to use the 'around' kanji (周).
-
Confusing 周期 with 頻度 (frequency).
→
Check context.
If you want to say 'how many times,' use 頻度. If you want to say 'how long between times,' use 周期.
-
Using 周期 as a suru-verb (周期する).
→
周期的に繰り返す
周期 is a noun and cannot be turned into a verb directly with 'suru'.
팁
Kanji Breakdown
Remember 周 means 'around' and 期 means 'time'. Together they are 'the time to go around.' This makes the meaning unforgettable.
Adjective Pairings
Always pair 周期 with '長い' (long) or '短い' (short) instead of '多い' or '少ない' when talking about the length of the cycle.
Nature Cycles
Japan is a country of cycles. Use 周期 when discussing the blooming of flowers or the return of migratory birds to sound more native.
Physics Tip
In physics problems, 周期 is usually denoted by the letter 'T'. Remembering this can help you connect your school knowledge to Japanese.
Medical Context
If you are using a health app in Japanese, 周期 is the key word for tracking almost any recurring metric.
Economy
When reading the Nikkei or economic news, look for 景気周期 to understand market trends.
Particle Usage
Use 'で' to indicate the interval: '28日の周期で' (on a 28-day cycle).
Katakana Alternative
Don't forget サイクル. It's often easier to use in a pinch if you forget 周期 during a conversation.
Compound Nouns
Japanese loves compound nouns. Try combining 周期 with other words like 睡眠 (sleep) or 更新 (update).
News Cues
When you hear 'shuuki,' expect a discussion about a pattern or a prediction of when something will happen next.
암기하기
기억법
Think of a 'SHOO' (shoe) going 'KI' (kick) in a circle. Each kick completes one SHUUKI (cycle).
시각적 연상
Imagine a circle with an arrow pointing back to the start. Inside the circle, write 'SHUUKI'.
Word Web
챌린지
Try to find three things in your room that have a 'shuuki' (like a clock, a plant's watering schedule, or a computer update) and say them out loud in Japanese.
어원
Borrowed from Middle Chinese. The kanji 周 (shu) originally depicted a field divided into sections, implying 'completeness' or 'going around.' The kanji 期 (ki) combines 'sieve/basket' and 'moon,' originally referring to a month or a set time based on the moon's phases.
원래 의미: The time it takes for the moon to complete its circuit.
Sino-Japanese (Kango).문화적 맥락
When discussing 'menstrual cycles' (生理周期), be mindful of the social context as it can be a private topic, though the word itself is medical and neutral.
In English, 'period' can also mean a dot at the end of a sentence or a school class. In Japanese, 周期 is strictly for repeating time intervals.
실생활에서 연습하기
실제 사용 상황
Health and Medicine
- 生理の周期
- 睡眠の周期
- 心拍の周期
- 薬の服用周期
Science and Nature
- 月の満ち欠けの周期
- 太陽の活動周期
- 振り子の周期
- 元素の周期律
Business and Economics
- 景気周期
- 製品の買い替え周期
- 在庫の回転周期
- 支払周期
Technology
- アップデートの周期
- バックアップの周期
- CPUの動作周期
- メンテナンスの周期
Daily Life
- 掃除の周期
- 美容院に行く周期
- ゴミ出しの周期
- 洗濯の周期
대화 시작하기
"睡眠の周期を整えるために、何かしていることはありますか? (Do you do anything to regulate your sleep cycle?)"
"最近、スマホの買い替え周期が長くなっていると思いませんか? (Don't you think the replacement cycle for smartphones is getting longer lately?)"
"あなたの仕事では、忙しい時期の周期はありますか? (In your work, is there a cycle of busy periods?)"
"ファッションの流行の周期についてどう思いますか? (What do you think about the cycle of fashion trends?)"
"この地域のゴミ出しの周期を教えていただけますか? (Could you tell me the garbage collection cycle for this area?)"
일기 주제
自分の生活の周期(ルーティン)を書き出してみましょう。 (Write out your lifestyle cycles/routines.)
最近、自分の周りで「周期的に繰り返されている」と感じることはありますか? (Is there anything around you lately that you feel is repeating periodically?)
理想的な睡眠周期について考えてみてください。 (Think about your ideal sleep cycle.)
歴史の周期について、自分の意見を書いてみましょう。 (Write your opinion on the cycles of history.)
一年の周期の中で、一番好きな時期とその理由を書いてください。 (Write about your favorite time in the one-year cycle and why.)
자주 묻는 질문
10 질문No, 周期 implies repetition. For a one-time event, use 期間 (kikan) for the duration or 日時 (nichiji) for the date and time.
Yes, you can talk about the 周期 of the seasons, although people usually just say 四季 (shiki) or 一年 (ichinen).
The most common way is to add '的に' to the end: 周期的に (shuuki-teki ni).
周期 is more formal and used in science/news. サイクル is more casual and common in marketing or daily life.
No, it is a noun. You must use it with a verb like 繰り返す (repeat) or 持つ (have).
Yes, '生理周期' (seiri shuuki) is the standard medical and polite term for the menstrual cycle.
It is the Japanese name for the Periodic Table of Elements in chemistry.
Yes, it can refer to the period of a sound wave or a rhythmic cycle in a composition.
Use '不規則な周期' (fukisoku na shuuki). This is common when talking about sleep or biological functions.
Technically no. In physics, they are inverses. However, in casual English, people sometimes use 'period' and 'frequency' loosely. In Japanese, keep them separate: 周期 (period) vs 頻度/周波数 (frequency).
셀프 테스트 192 질문
Write a sentence using '周期' to describe your sleep habits.
Well written! Good try! Check the sample answer below.
Translate: 'The moon's cycle is about 28 days.'
Well written! Good try! Check the sample answer below.
Use '周期的に' in a sentence about a machine.
Well written! Good try! Check the sample answer below.
Describe an 'irregular cycle' in Japanese.
Well written! Good try! Check the sample answer below.
Write 'Periodic Table' in kanji.
Well written! Good try! Check the sample answer below.
Translate: 'The business cycle influences the economy.'
Well written! Good try! Check the sample answer below.
Use '一定の周期で' to describe a sound.
Well written! Good try! Check the sample answer below.
Write a sentence about the seasons using '周期'.
Well written! Good try! Check the sample answer below.
Translate: 'I want to fix my lifestyle cycle.'
Well written! Good try! Check the sample answer below.
Explain the difference between 周期 and 期間 in one sentence (Japanese).
Well written! Good try! Check the sample answer below.
Write: 'short cycle' and 'long cycle' in Japanese.
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Translate: 'Measure the period of the wave.'
Well written! Good try! Check the sample answer below.
Use '周期' in a sentence about a comet.
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Write a sentence about 'turnover cycle' of skin.
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Translate: 'History repeats similar cycles.'
Well written! Good try! Check the sample answer below.
Use '周期' in a sentence about a traffic light.
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Translate: 'Biological clock' using '周期'.
Well written! Good try! Check the sample answer below.
Write a sentence about 'inventory turnover cycle'.
Well written! Good try! Check the sample answer below.
Translate: 'The update cycle of this software is fast.'
Well written! Good try! Check the sample answer below.
Describe a 'harmonic period' in Japanese.
Well written! Good try! Check the sample answer below.
Pronounce '周期' correctly. Focus on the long 'uu'.
Read this aloud:
당신의 답변:
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Say 'Sleep cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'At a fixed cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'The cycle is disrupted' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Periodically' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Business cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Periodic table' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Short cycle' and 'Long cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'The cycle of the moon' in Japanese.
Read this aloud:
당신의 답변:
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Say 'History repeats cycles' in Japanese.
Read this aloud:
당신의 답변:
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Ask: 'What is the update cycle?' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Regulate the cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Vibration period' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Inventory turnover cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Circadian rhythm (24-hour cycle)' in Japanese.
Read this aloud:
당신의 답변:
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Say 'The cycle changed' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Life cycle' (using shuuki) in Japanese.
Read this aloud:
당신의 답변:
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Say 'Measure the period' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Irregular cycle' in Japanese.
Read this aloud:
당신의 답변:
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Say 'Periodic maintenance' in Japanese.
Read this aloud:
당신의 답변:
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Listen to the word: 'Shuuki'. What does it mean?
If you hear 'Suimin no shuuki', what is being discussed?
If you hear 'Shuuki-teki ni', is the action happening once or repeatedly?
Identify the word: 'Keiki shuuki'.
If someone says 'Shuuki ga midareru', is that good or bad?
Identify the word: 'Shuuki ritsu hyou'.
If a cycle is 'mijikai', is it happening often or rarely?
Identify the word: 'Tsuki no shuuki'.
If you hear 'Ittei no shuuki de', what is the manner of action?
Identify the word: 'Seiri shuuki'.
If someone says 'Shuuki o totonoeru', what are they doing?
Identify the word: 'Koushin shuuki'.
If you hear 'Shindou shuuki', what is the context?
Identify the word: 'Shuuki-sei'.
If you hear 'Fukisoku na shuuki', is the pattern steady?
/ 192 correct
Perfect score!
Summary
The word '周期' is your go-to term for describing anything that repeats in a rhythmic or predictable pattern. While 'サイクル' is common in casual speech, '周期' provides the precision needed for professional and academic contexts. Example: '睡眠の周期' (sleep cycle).
- 周期 (shuuki) means 'period' or 'cycle' in Japanese.
- It refers to the time it takes for a repeating event to complete one full loop.
- It is commonly used in science, medicine, economics, and for regular routines.
- It is a formal noun and can be turned into an adverb with '的に' (shuuki-teki ni).
Kanji Breakdown
Remember 周 means 'around' and 期 means 'time'. Together they are 'the time to go around.' This makes the meaning unforgettable.
Adjective Pairings
Always pair 周期 with '長い' (long) or '短い' (short) instead of '多い' or '少ない' when talking about the length of the cycle.
Nature Cycles
Japan is a country of cycles. Use 周期 when discussing the blooming of flowers or the return of migratory birds to sound more native.
Physics Tip
In physics problems, 周期 is usually denoted by the letter 'T'. Remembering this can help you connect your school knowledge to Japanese.
관련 콘텐츠
nature 관련 단어
~上
B1'ue'는 '위' 또는 '상'을 의미합니다.
〜の上
A2무언가의 위나 상단에 있음을 나타냅니다. '책상 위에 책이 있다'는 'Tsukue no ue ni hon ga aru'입니다.
豊か
B1풍부하다; 넉넉하다. 자연이 풍부한 마을.
〜に従って
B1규칙에 따라서 행동해 주세요.
酸性雨
B1산성비는 대기 오염 물질로 인해 산도가 높아진 비를 말합니다.
営み
B1활동; 일상생활; 사업 (예: 삶의 활동).
順応する
B1새로운 환경이나 상황에 맞게 자신을 변화시키는 것.
~を背景に
B1~을 배경으로. 어떤 일이 일어나는 상황이나 원인으로서.
空気
A2air
大気汚染
B1대기 오염은 공기 중에 유해한 물질이 포함되어 환경이나 건강에 나쁜 영향을 주는 상태를 말합니다. '대기 오염을 줄이기 위해 대중교통을 이용합시다.'