At the A1 level, learners are introduced to '难度' (nándù) as a basic noun to describe how hard something is. At this stage, you should focus on the simplest sentence structure: [Noun] + 的 + 难度 + 很大 (very big) or 很小 (very small). You might use it to talk about your Chinese homework or a simple game. The primary goal is to distinguish it from the adjective '难' (nán). While you might say 'Chinese is hard' (中文很难), using '难度' allows you to say 'The difficulty of Chinese is high' (中文的难度很高). This adds a layer of formal structure to your speech. You will mostly see this word in the context of 'Difficulty: Easy' in apps or textbooks. It is a 'passive' vocabulary word at this level—you should recognize it when you see it, even if you don't use it in every sentence. Focus on the characters: '难' (difficult) and '度' (degree). Think of it as a thermometer for how hard a task is. Even at this early stage, avoiding the mistake of saying '很难度' will set a strong foundation for your future grammar.
At the A2 level, you begin to use '难度' more actively to describe your daily life and learning process. You should be able to use verbs like '增加' (zēngjiā - to increase) and '降低' (jiàngdī - to lower) in combination with '难度.' For example, '老师,请降低作业的难度' (Teacher, please lower the difficulty of the homework). This is the level where you start comparing the difficulty of different tasks using '比' (bǐ) structures, such as '这个任务比那个难度大' (This task's difficulty is greater than that one). You will encounter this word frequently in HSK 2 and 3 materials, especially in reading passages about sports, hobbies, and school subjects. You should also understand the phrase '很有难度' (yǒu nándù), which is a common way to say something is quite challenging. At A2, you are moving beyond simple adjectives and starting to use nouns to categorize your experiences. You might also notice '难度' in the settings of video games or mobile apps, where you can choose between different levels. Using this word correctly shows that you understand the difference between an attribute (hard) and a measurement (difficulty level).
At the B1 level, '难度' becomes an essential tool for professional and academic discussions. You should be comfortable using it to evaluate projects, discuss skill levels, and describe complex processes. You will start using more varied adjectives to modify '难度,' such as '相当的' (xiāngdāng de - considerable), '适中的' (shìzhōng de - moderate), or '极大的' (jídà de - enormous). For instance, '这项工作具有相当的难度' (This work has a considerable level of difficulty). You will also encounter '难度' in more abstract contexts, such as '沟通的难度' (the difficulty of communication) or '理解的难度' (the difficulty of understanding). At this level, you should be able to explain *why* something has a high difficulty level using '因为...所以...' structures. You will also hear this word in news reports or interviews when people discuss social issues like '就业难度' (the difficulty of finding employment). Your goal at B1 is to use '难度' to provide objective assessments rather than just personal feelings. You should also be able to recognize fixed phrases like '难度系数' (difficulty coefficient) in sports or technical contexts.
At the B2 level, you use '难度' with precision in formal writing and debate. You understand how to use it as a subject in complex sentences, such as '随着技术难度的提升,研发成本也在不断增加' (As technical difficulty increases, R&D costs are also continuously rising). You can distinguish between '难度' and its synonyms like '艰巨性' (jiānjùxìng - arduousness) or '复杂性' (fùzáxìng - complexity) with ease. In business contexts, you use '难度' to conduct risk assessments and feasibility studies. You might discuss '执行难度' (implementation difficulty) versus '理论难度' (theoretical difficulty). You are also expected to use more advanced verbs like '评估' (pínggū - to evaluate), '挑战' (tiǎozhàn - to challenge), and '克服' (kèfú - to overcome) in relation to '难度.' For example, '我们需要全面评估该项目的施工难度' (We need to fully evaluate the construction difficulty of this project). At B2, your usage of '难度' should reflect a nuanced understanding of how different factors contribute to the overall challenge of a situation. You should also be able to use the word in idiomatic or metaphorical ways in literature or high-level journalism.
At the C1 level, your use of '难度' is indistinguishable from a native speaker's. You use it to discuss subtle gradients of challenge in highly specialized fields, such as philosophy, advanced mathematics, or classical literature. You can analyze the '难度' of a text not just by its vocabulary, but by its rhetorical structure and cultural depth. You might use phrases like '审美难度' (aesthetic difficulty) or '认知难度' (cognitive difficulty) in academic essays. You are capable of discussing how '难度' serves as a barrier to entry in certain professions or social strata. For example, '这种法律文件的解读难度极高,普通人很难理解' (The difficulty of interpreting this kind of legal document is extremely high; it's hard for ordinary people to understand). You also understand the social implications of '难度'—how a society values tasks based on their perceived difficulty. In spoken Chinese, you can use '难度' in a self-deprecating or humorous way to describe mundane tasks that feel overwhelming. Your mastery includes knowing exactly when *not* to use '难度' and when a more specific term like '瓶颈' (píngjǐng - bottleneck) or '坎儿' (kǎnr - hurdle) would be more evocative.
At the C2 level, '难度' is a concept you can deconstruct and manipulate in sophisticated discourse. You can engage in philosophical debates about the nature of '难度' itself—is it an inherent property of an object or a relational property of the observer? You might discuss the '难度' of achieving world peace or the '难度' of defining human consciousness in a technical or philosophical treatise. Your vocabulary surrounding '难度' includes rare and archaic synonyms, and you can use the word in complex, multi-layered metaphors. For instance, you might write about the '难度' of maintaining one's integrity in a corrupt system, using the word to anchor a deep moral analysis. At this level, you are also a master of the 'difficulty' of the Chinese language itself, able to discuss the '难度' of different dialects or historical scripts with expert knowledge. You can navigate high-level professional environments, such as international diplomacy or corporate law, where the '难度' of a negotiation is influenced by myriad geopolitical and economic factors. Your use of '难度' is precise, authoritative, and contextually perfect, reflecting a lifetime of linguistic and cultural immersion.

The Chinese term 难度 (nándù) is a fundamental noun that every learner should master early in their journey. It translates directly to 'difficulty level' or 'degree of difficulty.' Unlike the adjective '难' (nán), which simply describes something as 'hard,' 难度 functions as a measurable concept. It allows speakers to quantify, compare, and discuss the specific challenges inherent in a task, an exam, a sports maneuver, or a professional project. In the context of modern Chinese society, where competition and evaluation are frequent, you will hear this word in classrooms, gyms, offices, and gaming communities. It provides a formal way to categorize the complexity of an action. For instance, in sports like diving or gymnastics, the 'difficulty score' is referred to using this term. In education, teachers will discuss the 难度 of a test paper to ensure it aligns with the students' current level. Understanding this word is crucial because it moves you from simple descriptions to more nuanced analysis of tasks.

Structural Breakdown
The word is composed of two characters: 难 (nán), meaning difficult or hard, and 度 (dù), meaning degree, extent, or measurement. Together, they form the 'degree of hardness.'

这次考试的难度超出了我的预期。(The difficulty of this exam exceeded my expectations.)

When using 难度, it is almost always followed by adjectives like '大' (dà - big/high) or '高' (gāo - high), rather than '难' itself. A common mistake for English speakers is saying '难度很难,' which is redundant. Instead, you should say '难度很大' or '难度很高.' This distinction marks the difference between a beginner and an intermediate speaker. Furthermore, the word is frequently used in professional settings to discuss project feasibility. If a manager asks about the 难度 of a new software implementation, they are looking for a technical assessment of the obstacles and resources required. In casual conversation, friends might use it to talk about a difficult video game level or a complex recipe they tried to cook. It is a versatile tool that bridges the gap between everyday talk and formal evaluation.

Common Collocations
增加难度 (zēngjiā nándù) - to increase the difficulty; 降低难度 (jiàngdī nándù) - to lower the difficulty; 适应难度 (shìyìng nándù) - to adapt to the difficulty level.

为了挑战自己,他选择了最高难度的模式。(In order to challenge himself, he chose the highest difficulty mode.)

Beyond physical or academic tasks, 难度 can also apply to social or emotional situations, though this is slightly more abstract. For example, '沟通的难度' (the difficulty of communication) suggests that the process of reaching an understanding is complex. In summary, this word is a building block for expressing how hard something is in a structured, objective way. Whether you are discussing a workout routine or a complex legal case, 难度 provides the necessary vocabulary to quantify the challenge ahead. It is often paired with verbs like '挑战' (tiǎozhàn - to challenge) or '评估' (pínggū - to evaluate), making it essential for anyone looking to work or study in a Chinese-speaking environment.

Cultural Note
In China, there is a high cultural value placed on overcoming 'high difficulty' tasks as a sign of character and perseverance (毅力). Calling something '有难度' (yǒu nándù - has difficulty) is often a respectful way of saying it is a worthy challenge.

这项工作虽然有难度,但我有信心完成。(Although this work has some difficulty, I have the confidence to complete it.)

教练根据运动员的水平调整了训练的难度。(The coach adjusted the training difficulty according to the athletes' level.)

初学者应该从低难度的任务开始练习。(Beginners should start practicing from low-difficulty tasks.)

Mastering the usage of 难度 (nándù) requires understanding its role as a noun. In English, we often say 'This is hard,' but in Chinese, to be more precise, we often say 'The difficulty of this is high.' This structural shift is where most learners struggle. When you want to describe the level of challenge, you typically use the pattern: [Subject] + [的] + 难度 + [很/非常] + [大/高]. For example, '这个任务的难度很大' (The difficulty of this task is very large). Notice that '大' (big) is used more frequently than '高' (high) in casual settings, though '高' is perfectly acceptable and often used in technical contexts like '难度系数' (difficulty coefficient).

Verb Pairings
Common verbs that take '难度' as an object include: 增加 (to increase), 降低 (to lower), 调整 (to adjust), 评估 (to evaluate), and 克服 (to overcome). For instance, '我们需要降低游戏的难度' (We need to lower the game's difficulty).

如果你觉得太简单了,我们可以增加一点难度。(If you feel it's too easy, we can increase the difficulty a bit.)

Another essential pattern is using '有' (to have) before '难度.' When you say something '有难度' (yǒu nándù), it functions similarly to saying something is 'challenging' or 'somewhat difficult.' It is a more polite and objective way than just saying '很难.' For example, '这个方案实施起来有一定难度' (There is a certain level of difficulty in implementing this plan). This phrasing is very common in business meetings where you want to highlight potential issues without sounding overly negative. It suggests that while there are obstacles, they are not necessarily insurmountable.

Adjective Modifiers
You can modify '难度' with adjectives like: 极大的 (enormous), 相当的 (considerable), 意想不到的 (unexpected), and 适中的 (moderate). Example: '考试题目具有相当的难度' (The exam questions have a considerable level of difficulty).

专家们正在评估这项手术的难度和风险。(Experts are evaluating the difficulty and risk of this surgery.)

In academic writing or news reports, you might see '难度' used in the subject position to discuss trends. '随着课程难度的提升,学生的压力也越来越大' (As the difficulty of the course increases, students' pressure also becomes greater). Here, the word acts as a catalyst for a cause-and-effect sentence. It is also found in the phrase '难度系数' (nándù xìshù), which is the technical term for 'difficulty coefficient' used in sports grading or standardized testing. This level of usage shows a high command of the language, moving beyond basic adjectives to professional-grade nouns.

Comparison Structures
Compared to '困难' (kùnnán - difficulty/trouble), '难度' is more about the level of the task itself, while '困难' often refers to the hardships or troubles one faces while doing it. You 'encounter a 困难' but you 'evaluate a 难度.'

这篇文章的翻译难度超乎想象。(The translation difficulty of this article is beyond imagination.)

为了保证公平,所有选手的题目难度都是一样的。(To ensure fairness, the difficulty of the questions for all contestants is the same.)

即使有很大的难度,他也从不放弃。(Even if there is great difficulty, he never gives up.)

In the real world, 难度 (nándù) is everywhere. If you are a student in China or taking a Chinese course, you will hear it every time an exam is approaching. Teachers will often say, '这次月考的难度会稍微大一点' (The difficulty of this monthly exam will be slightly higher). This is a standard way to manage student expectations. In the gaming world, which is massive in China, you'll see this word on every start screen. Options like '简单难度' (Easy difficulty), '普通难度' (Normal difficulty), and '地狱难度' (Hell difficulty) are ubiquitous. Gamers discuss the '难度曲线' (difficulty curve) of a game to describe how quickly it gets harder as they progress.

Sports and Competitions
In televised sports like diving, figure skating, or gymnastics, commentators constantly refer to the '难度动作' (difficulty moves). They will say, '这个动作的难度系数是3.5' (The difficulty coefficient of this move is 3.5).

他在比赛中完成了高难度的跳跃动作。(He completed a high-difficulty jumping move during the competition.)

In the workplace, 难度 is a key term during project planning and performance reviews. A project manager might say, '这个项目的技术难度非常高,我们需要更多时间' (The technical difficulty of this project is very high; we need more time). It serves as a professional justification for resource allocation or deadline extensions. During job interviews, an interviewer might ask, '你处理过的难度最大的任务是什么?' (What is the most difficult task you have ever handled?). Here, the word is used to probe the candidate's problem-solving skills and experience level. It is a more formal and structured way to talk about 'hard work' or 'tough jobs.'

Daily Life and Hobbies
You'll hear it at the gym when a trainer suggests increasing the '难度' of an exercise, or in a cooking class when a chef warns about the '难度' of making a specific pastry. It's the standard word for any graduated challenge.

这首歌的演唱难度很大,很少有人能唱好。(The difficulty of singing this song is very high; few people can sing it well.)

Finally, you will encounter this word in news headlines and social media discussions. When a new government policy is released, analysts might discuss the '执行难度' (difficulty of implementation). When a difficult puzzle or math problem goes viral, the caption often reads '挑战难度:五颗星' (Challenge difficulty: five stars). It is a word that categorizes the world into manageable levels of effort. Whether you are reading a technical manual or watching a talent show, 难度 is the metric used to judge the scale of human achievement and the obstacles in our path.

Common Contexts
Software UI: 游戏难度 (Game Difficulty); Education: 试卷难度 (Paper Difficulty); Sports: 动作难度 (Action Difficulty); Career: 工作难度 (Job Difficulty).

你可以根据自己的水平选择合适的难度。(You can choose the appropriate difficulty according to your own level.)

由于技术难度太大,这个计划被取消了。(Due to the technical difficulty being too great, this plan was canceled.)

现在的就业难度确实比以前增加了。(The difficulty of finding a job now has indeed increased compared to before.)

The most frequent mistake learners make with 难度 (nándù) is treating it like an adjective. In English, we say 'This is difficult,' where 'difficult' is an adjective. In Chinese, '难' (nán) is the adjective, but '难度' is a noun. You cannot say '这个题很难度' (This question is very difficulty). This is a direct translation error. Instead, you must say '这个题难度很大' (This question's difficulty is very big) or '这个题很有难度' (This question has difficulty). Remember: 难度 is a 'thing' (the level), not a 'description' of the thing.

The 'Difficult Difficulty' Error
Avoid saying '难度很难.' This sounds like 'The difficulty is hard' in English, which is redundant. Use '难度很大' (big difficulty) or '难度很高' (high difficulty) to sound natural.

❌ 错误:这门课的难度很难。
✅ 正确:这门课的难度很大。

Another mistake is confusing 难度 with '困难' (kùnnán). While they both relate to being hard, '困难' can be both a noun and an adjective, and it often refers to hardships, troubles, or poverty. For example, '生活很困难' means life is hard/struggling. '难度' is strictly for the 'level of challenge' in a task. You wouldn't say '生活的难度很大' unless you were jokingly referring to life as a video game. Use 难度 for tasks, exams, and skills; use '困难' for life struggles and obstacles.

Word Order Issues
Learners often forget the '的' (de) when connecting a subject to its difficulty. It should be [Subject] + 的 + 难度. For example, '游戏的难度' (the difficulty of the game), not just '游戏难度' (though the latter is used in compound terms like UI labels).

❌ 错误:我遇到了一个难度
✅ 正确:我遇到了一个困难。/ 这个任务很有难度

Finally, watch out for the verb choice. You 'increase' (增加) or 'lower' (降低) 难度. Some learners try to use '变' (biàn - to become) incorrectly, like '难度变了难' (The difficulty became hard). Instead, use '难度提高了' (The difficulty has been raised) or '难度加大了' (The difficulty has been increased). Being precise with these verbs will make your Chinese sound much more sophisticated and professional.

Key Takeaway
'难' is HOW it feels. '难度' is WHAT it is. Treat '难度' as a scale from 1 to 10.

❌ 错误:这首歌太难度了。
✅ 正确:这首歌太难了。/ 这首歌的难度太大了。

❌ 错误:我想降低考试的难。
✅ 正确:我想降低考试的难度

❌ 错误:这个动作有很高难。
✅ 正确:这个动作有很高难度

When discussing challenges in Chinese, 难度 (nándù) is just one of several options. Understanding the subtle differences between these synonyms will help you choose the right word for the right context. The most common alternative is '困难' (kùnnán). While 难度 focuses on the objective level of a task (like a game setting), '困难' focuses on the subjective experience of struggle or the presence of obstacles. If you are stuck in traffic and late for a meeting, that is a '困难,' not a '难度.' If you are solving a complex math problem, that problem has a high '难度.'

Comparison: 难度 vs. 困难
难度: Objective, measurable level of a task. Used with: 大, 高, 增加, 降低.
困难: Subjective, hardships, obstacles. Used with: 克服, 面对, 解决.

任务的难度很大,但我们要克服所有困难。(The task's difficulty is great, but we must overcome all hardships.)

Another related term is '挑战' (tiǎozhàn), which means 'challenge.' While 难度 is a neutral description of a level, '挑战' has a more active and often positive connotation. You 'take on a challenge' (迎接挑战). If something has '难度,' it is a '挑战.' In a professional setting, calling a task a '挑战' sounds more proactive than just saying it has '很大难度.' Furthermore, '艰巨' (jiānjù) is an adjective used for very difficult and heavy tasks, like '艰巨的任务' (a daunting/arduous task). This is much stronger than just saying '有难度.'

Comparison: 难度 vs. 复杂 (fùzá)
难度: How hard it is to finish.
复杂: How many parts or steps it has. A task can be simple but have high 难度 (like lifting a very heavy weight), or it can be very complex but have low 难度 (like sorting 10,000 buttons by color).

这个项目不仅难度高,而且非常复杂。(This project is not only high in difficulty but also very complex.)

In more formal or academic contexts, you might encounter '难点' (nándiǎn), which refers to a specific 'difficult point' or 'knotty problem' within a larger subject. For example, '这课的难点是语法' (The difficult point of this lesson is the grammar). While 难度 describes the whole, '难点' pinpoints the specific part that makes it hard. Finally, '费劲' (fèijìn) is a colloquial term meaning 'strenuous' or 'takes a lot of effort.' You might say '读这本书很费劲' if the language is archaic. It’s a more physical, visceral way to describe difficulty compared to the objective 难度.

Summary Table
1. 难度: Degree/Level (Noun); 2. 困难: Hardship/Trouble (Noun/Adj); 3. 挑战: Challenge (Noun/Verb); 4. 难点: Specific hard part (Noun); 5. 艰巨: Arduous/Formidable (Adj).

虽然这只是个低难度的任务,但处理起来很费劲。(Although this is just a low-difficulty task, it is very strenuous to handle.)

我们必须找出试卷中的所有难点,以降低整体难度。(We must find all the difficult points in the exam paper to lower the overall difficulty.)

这是一项艰巨的任务,难度远超我们的想象。(This is an arduous task; the difficulty is far beyond our imagination.)

Beispiele nach Niveau

1

这个作业的难度很大。

The difficulty of this homework is very big.

Uses '难度' as a noun modified by '很大'.

2

我不喜欢高难度的游戏。

I don't like high-difficulty games.

Uses '高难度' as a compound adjective modifying '游戏'.

3

老师,考试的难度高吗?

Teacher, is the exam difficulty high?

A simple question using '难度' and '高'.

4

这个题的难度还可以。

The difficulty of this question is okay.

Uses '还可以' to describe the level of difficulty.

5

我想选一个低难度的课。

I want to choose a low-difficulty course.

Uses '低难度' to modify '课'.

6

那个动作难度太小了。

The difficulty of that move is too small.

Uses '太小了' to describe low difficulty.

7

这里的难度是一星。

The difficulty here is one star.

Uses '难度' with a specific rating.

8

增加难度很好玩。

Increasing the difficulty is fun.

Uses '增加' as a verb for '难度'.

1

我们需要降低一点难度。

We need to lower the difficulty a bit.

Uses '降低' (to lower) with '难度'.

2

这首歌很有难度,你会唱吗?

This song is very difficult (has difficulty), can you sing it?

Uses the common phrase '很有难度'.

3

我觉得听力的难度比阅读大。

I think the difficulty of listening is greater than reading.

A comparison structure using '比'.

4

这个游戏的难度可以调整吗?

Can the difficulty of this game be adjusted?

Uses '调整' (to adjust) with '难度'.

5

虽然有难度,但我还是想试试。

Although it's difficult, I still want to try.

Uses '虽然...但是' with '有难度'.

6

初学者应该选择中等难度的题目。

Beginners should choose medium-difficulty questions.

Uses '中等难度' (medium difficulty).

7

这次汉语水平考试的难度怎么样?

How was the difficulty of this HSK exam?

Asks about the level using '怎么样'.

8

他喜欢挑战高难度的任务。

He likes to challenge high-difficulty tasks.

Uses '挑战' (to challenge) with '高难度'.

1

为了适应市场,公司降低了产品的操作难度。

In order to adapt to the market, the company lowered the operational difficulty of the product.

Uses '操作难度' (operational difficulty) as a compound noun.

2

这篇文章的翻译难度超出了我的预期。

The translation difficulty of this article exceeded my expectations.

Uses '超出预期' (exceeded expectations) with '难度'.

3

专家们正在讨论方案的技术难度。

Experts are discussing the technical difficulty of the plan.

Uses '技术难度' (technical difficulty).

4

如果你觉得没难度,我们就换个难点的。

If you feel there's no difficulty, we'll change to a harder one.

Uses '没难度' (no difficulty) in a conditional sentence.

5

这种手术的难度极大,风险也高。

The difficulty of this kind of surgery is enormous, and the risk is also high.

Uses '极大' (enormous) to modify '难度'.

6

他能完成这个动作是因为他练习了很久,尽管难度很高。

He can complete this move because he practiced for a long time, despite the high difficulty.

Uses '尽管' (despite) with '难度'.

7

目前的就业难度让很多年轻人感到压力。

The current difficulty of finding a job makes many young people feel stressed.

Uses '就业难度' (employment difficulty) as a subject.

8

请根据学生的实际水平来设定难度。

Please set the difficulty according to the students' actual level.

Uses '设定' (to set) with '难度'.

1

由于施工难度太大,大桥的工期被推迟了。

Due to the construction difficulty being too great, the bridge's construction period was postponed.

Uses '施工难度' (construction difficulty) in a causal sentence.

2

这名运动员以极高的难度系数获得了冠军。

This athlete won the championship with an extremely high difficulty coefficient.

Uses the technical term '难度系数' (difficulty coefficient).

3

我们必须充分考虑到执行过程中的各种难度。

We must fully take into account various difficulties in the execution process.

Uses '各种难度' to imply multiple types of challenges.

4

这篇文章通过对比,分析了两国改革的难度。

This article analyzes the difficulty of reforms in the two countries through comparison.

Uses '难度' in a formal analytical context.

5

这种语言的语法难度是公认的。

The grammatical difficulty of this language is universally acknowledged.

Uses '语法难度' (grammatical difficulty).

6

他试图通过增加难度来激发团队的创造力。

He tried to stimulate the team's creativity by increasing the difficulty.

Uses '通过...来...' with '增加难度'.

7

对于初学者来说,平衡难度和趣味性非常重要。

For beginners, balancing difficulty and fun is very important.

Uses '平衡' (to balance) with '难度'.

8

尽管存在一定的技术难度,但该项目仍具可行性。

Despite a certain degree of technical difficulty, the project is still feasible.

Uses '存在' (to exist) and '可行性' (feasibility).

1

该著作的逻辑严密,阅读难度令人生畏。

The logic of this work is rigorous, and its reading difficulty is daunting.

Uses '令人生畏' (daunting/awesome) to describe '难度'.

2

在评估政策影响时,我们不能忽视其落地的难度。

When evaluating policy impact, we cannot ignore the difficulty of its implementation.

Uses '落地' (to land/implement) as a modifier for '难度'.

3

这部电影的拍摄难度主要在于极端的地理环境。

The difficulty of filming this movie lies mainly in the extreme geographical environment.

Uses '在于' (lies in) to explain the source of '难度'.

4

我们需要在保证安全的前提下,尽可能挑战动作的难度极限。

We need to challenge the limits of movement difficulty as much as possible while ensuring safety.

Uses '难度极限' (limits of difficulty).

5

这种艺术形式的受众有限,部分原因在于其审美难度较高。

The audience for this art form is limited, partly due to its high aesthetic difficulty.

Uses '审美难度' (aesthetic difficulty).

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