Idiom 非正式 6分钟阅读

to make neither head nor tail of

To be completely unable to understand something.

字面意思: to make neither head nor tail of

Use can't make head nor tail of when something is so confusing, you can't grasp any part of it.

15秒了解

  • Completely unable to understand.
  • Used when something is baffling.
  • Originates from identifying key parts.
  • Best for casual or semi-formal chats.

意思

这个短语的意思是,当你试图理解某事时,你会完全不知所措。这就像看着一个没有说明书的拼图盒子——你能看到碎片,但它们就是无法拼凑成任何有逻辑的图像。它带有一种真正的困惑感,有时还带有一丝沮丧。

关键例句

3 / 12
1

Texting a friend about a confusing movie plot

Dude, after that last twist, I seriously can't make head nor tail of this movie anymore.

I can't understand this movie anymore.

😊
2

Trying to assemble furniture with unclear instructions

These instructions are a joke; I can't make head nor tail of step 3.

I can't understand step 3.

😄
3

Discussing a complex scientific article

I read the abstract twice, but I still can't make head nor tail of the methodology section.

I can't understand the methodology section.

🌍

文化背景

This idiom likely emerged from a time when understanding the 'head' (beginning, main point) and 'tail' (end, conclusion) was crucial for comprehending narratives or instructions. Its existence highlights a fundamental human need to find logic and structure. The phrase persists because the feeling of being utterly lost in complex information is timeless, resonating across different eras and cultures.

💡

Negative is Key!

This phrase is almost always used in the negative (can't or couldn't). Saying 'I can make head nor tail of it' sounds strange and usually means the opposite of what you intend.

💬

A Universal Feeling

The feeling of being utterly confused transcends culture. This idiom resonates because everyone, at some point, encounters something that just doesn't make sense, whether it's ancient hieroglyphics or a modern meme.

15秒了解

  • Completely unable to understand.
  • Used when something is baffling.
  • Originates from identifying key parts.
  • Best for casual or semi-formal chats.

What It Means

Ever feel like your brain just hit a brick wall trying to figure something out? That's exactly when you'd say you can't make head nor tail of it. It’s not just a little confusing; it's completely baffling. You're looking at information, a situation, or even instructions, and nothing makes sense. It’s like trying to read a book written in a language you’ve never seen before. There's a total lack of comprehension, and you feel a bit helpless. It’s that moment when you stare blankly, wondering if you’re the only one who doesn't get it. It’s a strong way to say something is utterly incomprehensible.

Origin Story

The exact origin of make neither head nor tail of is a bit murky, like trying to find a specific sock in a laundry pile. However, most linguists point to the 17th century. Back then, people often referred to the head and tail of things, like the beginning and end of a story or the main point and its details. Imagine trying to follow a convoluted argument or a poorly written instruction manual. If you couldn't grasp the beginning (head) or the conclusion (tail), you'd be lost. It’s also possible it relates to the confusion of trying to make sense of animal entrails during divination or butchery – you couldn't tell which part was which! So, the idea is that you can't identify the essential parts (head or tail) to understand the whole.

How To Use It

This phrase is your go-to when you're genuinely stumped. You use it to express that a specific piece of information or a situation is completely beyond your understanding. It’s usually said after you've tried to figure something out. You might say it to a friend after looking at a confusing spreadsheet, or to a colleague after a baffling meeting. It’s a vivid way to admit defeat in the face of complexity. Just remember, it’s about understanding, not about physical inability. You’re not missing a body part; you’re missing the point!

Real-Life Examples

Imagine scrolling through TikTok and seeing a dance trend that looks like pure chaos. You might text your friend, "I’ve watched that new dance challenge five times, and I still can't make head nor tail of it." Or perhaps you're assembling IKEA furniture. You stare at the diagram, then at the pieces, and mutter, "This manual is impossible! I can't make head nor tail of these instructions." It applies to anything from complex scientific theories to your uncle's conspiracy theories at Thanksgiving dinner. Even a confusing plot twist in a Netflix show can leave you feeling this way. It’s a universally relatable feeling of being completely out of the loop.

When To Use It

Use make neither head nor tail of when you are facing something genuinely confusing. This could be a complex document, a confusing set of instructions, an unclear explanation, or a baffling situation. It's perfect for when you've invested some effort into understanding but have failed. It works well in informal and semi-formal settings. Think about explaining your confusion to a friend, a family member, or a colleague. It’s also great for adding a touch of relatable humor to your confusion. It signals that the problem lies with the information, not necessarily with your intelligence.

When NOT To Use It

Avoid using make neither head nor tail of in very formal situations, like writing a legal document or presenting a critical business report where clarity is paramount. It can sound a bit too casual or even slightly unprofessional if used inappropriately. Also, don't use it if you actually understand the topic but are just pretending not to, or if you haven't even tried to understand it yet. It implies a genuine effort has been made and failed. It's also not suitable for situations where you need to appear in control and knowledgeable. Saying this in a job interview about the company's mission statement? Probably not the best idea unless you want to be confused about why you didn't get the job!

Common Mistakes

Learners sometimes misuse this phrase by trying to simplify it or by using parts of it incorrectly. The whole idiom is important for its meaning. Another common slip-up is using it when something is just slightly unclear, rather than completely incomprehensible. It’s a strong phrase, so save it for when you’re truly baffled. Also, remember it's usually used with a negative, like can't make head nor tail of it. Using it positively (I can make head nor tail of it) sounds odd and implies you can understand the head and tail, which isn't the intended meaning.

✗ I can make head nor tail of this.

✓ I can't make head nor tail of this.

Similar Expressions

There are many ways to say you don't understand something. Some are more casual, others more formal. It goes over my head is similar, suggesting something is too complex or sophisticated for you to grasp. I don't get it is a very common, simple way to express confusion. It's all Greek to me is another classic idiom implying something is completely unintelligible, often due to language or unfamiliarity. I'm clueless means you have no idea what's going on. It's beyond me suggests something is too difficult or mysterious to comprehend.

Memory Trick

💡

Picture yourself trying to assemble a bizarre creature. You're given a box of parts. You can't tell which is the head and which is the tail. Because you can't identify these basic, essential parts, the whole creature makes no sense. You can't make head nor tail of it. The lack of recognizable head and tail symbolizes the lack of understanding. It’s a messy, confusing jumble, just like the information you can't process!

Quick FAQ

  • What does make neither head nor tail of mean? It means you are completely unable to understand something, finding it totally confusing or illogical.
  • Is this phrase formal or informal? It's generally informal to neutral, best used in casual conversations or semi-formal settings, but not in highly formal writing or speeches.
  • Can I use it if something is just a little confusing? No, it implies total confusion, not just mild uncertainty. You're completely baffled.
  • What if I only understand part of it? This phrase is for when you understand nothing. If you grasp some elements, you'd use different wording.
  • Does it always have to be negative? Yes, it's almost always used with 'can't' or 'couldn't' to express lack of understanding. Saying 'I can make head nor tail of it' is rare and confusing.
  • Is it old-fashioned? While it has historical roots, it's still commonly used today in everyday English. It's not outdated at all!
💡

Negative is Key!

This phrase is almost always used in the negative (can't or couldn't). Saying 'I can make head nor tail of it' sounds strange and usually means the opposite of what you intend.

💬

A Universal Feeling

The feeling of being utterly confused transcends culture. This idiom resonates because everyone, at some point, encounters something that just doesn't make sense, whether it's ancient hieroglyphics or a modern meme.

🎯

Save It for True Bafflement

Don't overuse this idiom for minor confusion. It's a strong phrase for when you are genuinely stumped. Think 'complete mental roadblock'!

⚠️

Avoid in Formal Settings

While common, it's informal. Using it in a job application cover letter or a formal academic paper might make you sound unprofessional. Stick to 'I do not understand' or 'I find this unclear' instead.

💡

Focus on the 'Why'

The phrase implies you can't grasp the reason, logic, or structure behind something. It's not just about not knowing the answer, but not understanding the question or the setup.

例句

12
#1 Texting a friend about a confusing movie plot
😊

Dude, after that last twist, I seriously can't make head nor tail of this movie anymore.

I can't understand this movie anymore.

Expresses complete confusion about the movie's plot.

#2 Trying to assemble furniture with unclear instructions
😄

These instructions are a joke; I can't make head nor tail of step 3.

I can't understand step 3.

Highlights difficulty understanding specific instructions.

#3 Discussing a complex scientific article

I read the abstract twice, but I still can't make head nor tail of the methodology section.

I can't understand the methodology section.

Shows inability to comprehend technical details.

#4 Instagram caption about a confusing travel experience
😊

Navigating these backstreets was wild! Pretty sure I couldn't make head nor tail of the map.

I couldn't understand the map.

Relatable travel mishap, emphasizing disorientation.

#5 WhatsApp message after a confusing online meeting
😊

That Zoom call was something else. I can't make head nor tail of what they decided.

I can't understand what they decided.

Modern context of virtual communication confusion.

#6 Job interview follow-up email
💼

Thank you for the interview. While I found the discussion insightful, I must admit I couldn't make head nor tail of the proposed project timeline.

I couldn't understand the project timeline.

Used cautiously in a professional context to point out ambiguity.

#7 Explaining a difficult concept to a colleague
😄

I've tried explaining the new software update, but honestly, I can't make head nor tail of its logic myself.

I can't understand its logic myself.

Humorous self-deprecation about understanding a complex system.

#8 Feeling overwhelmed by too much information
💭

After reading all these reviews, I still can't make head nor tail of which phone to buy!

I still can't decide which phone to buy.

Expresses decision paralysis due to information overload.

Common mistake: Using the phrase positively 常见错误
😊

✗ I can make head nor tail of this complicated recipe.

I can understand this complicated recipe.

The phrase is almost exclusively used negatively to express lack of understanding.

Common mistake: Using only part of the idiom 常见错误
😊

✗ I can't make the head of this document.

I can't understand the beginning of this document.

The idiom requires both 'head' and 'tail' (or similar structure) to convey the meaning of total confusion.

#11 TikTok comment on a confusing tutorial
😊

This tutorial is supposed to be easy? I can't make head nor tail of it! 😭

I can't understand this tutorial!

Expresses frustration and confusion in a typical social media comment.

#12 Explaining why you didn't finish a task
💼

Sorry, I couldn't finish the report. I just couldn't make head nor tail of the data provided.

I couldn't understand the data.

Provides a reason for incompletion based on incomprehension.

自我测试

Fill in the blank with the correct phrase.

✓ 正确! ✗ 不太对。 正确答案: head nor tail

The idiom 'make neither head nor tail of' means to be completely unable to understand something. The blank requires the core part of this idiom.

Choose the sentence that uses the phrase correctly.

Which sentence uses 'make neither head nor tail of' correctly?

✓ 正确! ✗ 不太对。 正确答案: B

Option B correctly uses the phrase in the negative ('couldn't') to express a lack of understanding about complex instructions. Options A, C, and D misuse the phrase or its typical negative structure.

Find and fix the error in the sentence.

✓ 正确! ✗ 不太对。 正确答案:

The idiom is 'make head nor tail of', not 'make a head nor tail of'. The article 'a' is unnecessary and incorrect here.

Translate the sentence into English.

✓ 正确! ✗ 不太对。 正确答案:

The French sentence expresses total lack of understanding, which is perfectly captured by the English idiom 'can't make head nor tail of it'.

Fill in the blank with the correct phrase.

✓ 正确! ✗ 不太对。 正确答案: head nor tail

The phrase 'make head nor tail of' specifically means to be completely unable to understand the reason or logic behind something, fitting the context perfectly.

Find and fix the error in the sentence.

✓ 正确! ✗ 不太对。 正确答案:

The correct preposition to use with the idiom 'make head nor tail' is 'of', not 'from'. It signifies incomprehension of the subject matter.

Choose the sentence that uses the phrase correctly.

Which sentence best expresses complete confusion using the idiom?

✓ 正确! ✗ 不太对。 正确答案: C

Option C correctly uses 'couldn't make head nor tail of' to describe being unable to understand a cryptic message. Option A is contradictory, B is a bit too literal for the idiom's typical use, and D uses the future tense awkwardly.

Put the words in the correct order to form a sentence.

✓ 正确! ✗ 不太对。 正确答案:

This order forms the standard negative expression of the idiom, meaning 'I am completely unable to understand it'.

Fill in the blank with the correct phrase.

✓ 正确! ✗ 不太对。 正确答案: make head nor tail

The phrase 'make head nor tail of' is used for complete incomprehension, especially when dealing with complex or abstract subjects like philosophical arguments.

Find and fix the error in the sentence.

✓ 正确! ✗ 不太对。 正确答案:

While grammatically possible, the context implies the speaker shouldn't be able to understand quantum physics. The claim 'could make head nor tail' sounds boastful or unbelievable unless the subject was simple. The more natural interpretation of confusion would use 'couldn't make head nor tail'.

Translate the sentence into English.

✓ 正确! ✗ 不太对。 正确答案:

The Spanish sentence conveys total incomprehension, similar to the English idiom 'couldn't make head nor tail of', emphasizing the feeling of it being completely unintelligible.

Match the phrase with its closest meaning.

✓ 正确! ✗ 不太对。 正确答案:

These phrases all relate to a lack of understanding, but 'make head nor tail of' specifically implies a fundamental inability to grasp the structure or logic of something.

🎉 得分: /12

视觉学习工具

Formality Spectrum for 'Make Neither Head Nor Tail Of'

Very Informal

Casual chat with friends, texting.

OMG, I can't make head nor tail of this TikTok dance!

Neutral/Informal

Everyday conversations, emails to colleagues.

I've read the report twice, but I still can't make head nor tail of the conclusion.

Slightly Formal

Careful use in professional settings when expressing genuine confusion.

Regarding the project proposal, I couldn't make head nor tail of the budget breakdown.

Very Formal

Avoid in highly formal documents, speeches, or situations requiring strict professionalism.

This phrase would be inappropriate in a legal brief.

When You Can't Make Head Nor Tail Of Something

Utter Confusion
📦

Assembling IKEA furniture

These diagrams are impossible! I can't make head nor tail of them.

💻

Understanding complex code

This legacy code is spaghetti. I can't make head nor tail of it.

🎬

Following a convoluted movie plot

What just happened? I can't make head nor tail of the ending!

Deciphering unclear instructions

Can you explain this? I can't make head nor tail of these instructions.

🗣️

Listening to jargon-filled speech

He spoke for an hour, but I couldn't make head nor tail of his argument.

🌐

Navigating a foreign system (e.g., app, bureaucracy)

Trying to file my taxes online... I can't make head nor tail of this website!

Confusion: Idiom Comparison

Make Head Nor Tail Of
Meaning Completely unable to understand the structure or logic.
Vibe Frustrated bafflement.
Usage Instructions, complex ideas, confusing situations.
It's All Greek To Me
Meaning Completely unintelligible, often due to language or unfamiliarity.
Vibe Total foreignness.
Usage Foreign languages, highly specialized subjects.
Over My Head
Meaning Something is too difficult or advanced for one's current level.
Vibe Feeling overwhelmed by complexity.
Usage Advanced topics, challenging tasks.

Scenarios for 'Make Neither Head Nor Tail Of'

🛠️

Instructions & Manuals

  • IKEA furniture assembly
  • Software setup guides
  • DIY project steps
📚

Complex Information

  • Scientific papers
  • Legal documents
  • Financial reports
💡

Abstract Concepts

  • Philosophical arguments
  • Theoretical physics
  • Abstract art explanations

Confusing Situations

  • Ambiguous social cues
  • Unclear directions
  • Bizarre plot twists

练习题库

12 练习
Fill in the blank. Fill Blank beginner

This knitting pattern is so confusing! I can't make ___ ___ ___ ___ of it.

✓ 正确! ✗ 不太对。 正确答案: head nor tail

The idiom 'make head nor tail of' is used when something is completely incomprehensible.

Fill in the blank. Fill Blank intermediate

I tried to follow the legal document, but I couldn't make ___ ___ ___ ___ of the clauses.

✓ 正确! ✗ 不太对。 正确答案: head nor tail

This phrase is ideal for expressing complete confusion when faced with complex or technical language like legal terms.

Find and fix the error. Error Fix beginner

找出并修正错误:

I can't make head nor tail for this math problem.

✓ 正确! ✗ 不太对。 正确答案: I can't make head nor tail of this math problem.

The correct preposition to use with the idiom 'make head nor tail' is 'of'.

Find and fix the error. Error Fix advanced

找出并修正错误:

She confessed she could make head nor tail of his sudden change in behavior.

✓ 正确! ✗ 不太对。 正确答案: She confessed she couldn't make head nor tail of his sudden change in behavior.

In this context, 'confessed' implies admitting a lack of understanding, making the negative form 'couldn't make head nor tail of' the appropriate choice.

Put the words in order. Reorder beginner

将单词按正确顺序排列:

点击上方单词来构建句子

✓ 正确! ✗ 不太对。 正确答案: I can't make head nor tail of it.

This reconstructs the common negative usage of the idiom to express complete confusion.

Put the words in order. Reorder intermediate

将单词按正确顺序排列:

点击上方单词来构建句子

✓ 正确! ✗ 不太对。 正确答案: I couldn't make head nor tail of what the tail.

This sentence uses the idiom correctly to express incomprehension about a specific subject ('what the tail' - assuming 'tail' here is a typo for something like 'talk' or 'plan' in a real scenario, but following the provided words).

Translate the sentence. Translate beginner

I don't understand this map.

提示: Think of an idiom for complete confusion., Use the negative form.

✓ 正确! ✗ 不太对。 正确答案: I can't make head nor tail of this map.

This translates a simple statement of confusion into the idiomatic expression 'can't make head nor tail of'.

Translate the sentence. Translate advanced

La verdad, no pude entender nada de su explicación.

提示: 'No pude entender nada' means 'I couldn't understand anything'., Use the idiom that implies total lack of comprehension.

✓ 正确! ✗ 不太对。 正确答案: Honestly, I couldn't make head nor tail of his explanation.

The Spanish phrase indicates complete lack of understanding, which is precisely what the English idiom 'couldn't make head nor tail of' conveys.

Choose the correct sentence. Choose beginner

Which sentence uses the idiom correctly?

✓ 正确! ✗ 不太对。 正确答案: B

The idiom implies significant confusion. Option B uses it correctly with 'couldn't' and 'complex instructions' (implied). The others are contradictory or misuse the phrase.

Choose the correct sentence. Choose intermediate

Select the sentence that uses the idiom idiomatically.

✓ 正确! ✗ 不太对。 正确答案: A

Option A correctly uses the negative form to express confusion about a reason. Option B is awkward; 'figure out' or 'understand' would be better. C uses future tense unnaturally. D is contradictory.

Match the phrase to its meaning. Match beginner

将左侧的每个项目与右侧的配对匹配:

✓ 正确! ✗ 不太对。 正确答案:

This exercise helps reinforce the core meaning of 'make head nor tail of' by contrasting it with related concepts.

Match the phrase with its closest synonym. Match intermediate

将左侧的每个项目与右侧的配对匹配:

✓ 正确! ✗ 不太对。 正确答案:

These options provide various ways to express the same core idea of incomprehension, helping learners expand their vocabulary around this concept.

🎉 得分: /12

常见问题

21 个问题

It means you are completely unable to understand something. Imagine trying to assemble furniture with instructions where you can't even identify the 'head' or the 'tail' piece – everything is just a confusing mess. It signifies a total lack of comprehension.

Yes, absolutely! While it has historical roots, can't make head nor tail of is still a very common and natural-sounding idiom in everyday spoken English. You'll hear it in casual conversations, see it in texts, and maybe even find it in less formal online content.

'I don't get it' is a simpler, more general way to say you don't understand. 'Can't make head nor tail of' implies a deeper level of confusion, suggesting that the subject itself is illogical or poorly structured, making it impossible to grasp its core meaning.

No, it's best reserved for situations where you are completely baffled. Using it for something only mildly unclear might sound like an exaggeration. Think of it as a last resort when all attempts at understanding have failed.

Pretty much anything you find incomprehensible! This includes complex instructions, confusing directions, abstract theories, illogical arguments, poorly written texts, or even baffling social situations. If it leaves you scratching your head, you probably can't make head nor tail of it.

It depends on the context and your relationship with the recipient. In a casual email to a colleague you know well, it might be fine. However, in a formal email to a superior, a client, or in official documentation, it's generally safer to use more formal language like 'I am having difficulty understanding' or 'This is unclear to me'.

Almost always. The idiom is fundamentally about a lack of understanding. Saying 'I can make head nor tail of it' is very rare and usually sounds contradictory or sarcastic, implying you should be able to understand it but perhaps aren't trying hard enough, or that it's surprisingly simple (which defeats the idiom's purpose).

That's a great way to think about it! The idiom implies you can't grasp either the beginning/main point ('head') or the end/conclusion ('tail'), making the whole thing incomprehensible. If you understood one part but not the other, you'd likely say something like, 'I understand the introduction, but the conclusion doesn't make sense'.

Yes, the concept of being utterly confused is universal. Many languages have idioms for this, like 'C'est du chinois pour moi' (It's Chinese to me) in French, or 'No entiendo nada' (I don't understand anything) in Spanish, conveying a similar sense of complete incomprehensibility.

The 'head' likely refers to the beginning or main part, and the 'tail' to the end or conclusion. The idiom suggests you can't even identify these fundamental components, let alone understand the whole. It likely dates back to the 17th century, reflecting a time when understanding the structure of things was key to comprehension.

Yes, 'make neither head nor tail of' is the full, older form of the idiom. However, in modern usage, it's far more common to hear the negative contraction, 'can't make head nor tail of'. Both convey the same meaning of complete confusion.

A frequent error is using the positive form ('I can make head nor tail...') or forgetting the negative ('can't'/'couldn't'). Another mistake is altering the core phrase, like saying 'make a head nor tail'. Remember, it's about the inability to understand, so the negative is crucial.

'Going over my head' usually implies something is too complex, advanced, or perhaps even secret for you to grasp. 'Can't make head nor tail of' suggests a more fundamental lack of logic or structure in the thing itself, making it impossible to understand, rather than just being too difficult for your level.

Absolutely! You can use it self-deprecatingly, like 'I tried to follow the recipe, but I couldn't make head nor tail of it – guess I'm sticking to toast!' It adds a light touch to admitting confusion, making it relatable and funny.

In urgent situations, admitting you 'can't make head nor tail of it' might not be ideal unless you immediately follow up with a request for help. For example, 'I can't make head nor tail of this emergency procedure; please guide me through it step-by-step!'

Historically, 'head' and 'tail' could refer to the beginning and end of a story, the main point and supporting details of an argument, or even the front and back of a document. The key is that you can't identify or make sense of these essential parts to grasp the whole.

The simplest way to say it is 'I don't understand at all' or 'It makes no sense to me'. The idiom just adds a bit more color and emphasis to that basic meaning.

While 'neither head nor tail' is the classic form, you'll most commonly hear and use the negative version: 'can't make head nor tail of'. Sometimes people might say 'cannot make head nor tail', which is just a more formal way of saying the same thing.

It often implies the thing you're trying to understand is flawed (illogical, poorly explained, complex), making your understanding impossible. However, it can sometimes be used with a touch of self-deprecation, suggesting your own ability to grasp it is failing, even if the material itself isn't inherently flawed.

Yes, definitely! If someone acts in a way that seems contradictory or illogical, you might say, 'I can't make head nor tail of why they reacted that way.' It’s perfect for expressing confusion about motivations or actions.

Try using it in low-stakes situations! Explain a confusing movie plot to a friend, describe your struggles with a new app, or joke about a complicated recipe. The key is to use it when you genuinely feel baffled, and pair it with a brief explanation of what is confusing.

相关表达

🔄

It's all Greek to me

synonym

Completely unintelligible, as if written or spoken in a foreign language.

Both phrases indicate a total lack of understanding, often used when faced with something foreign or overly complex.

🔗

Go over someone's head

related topic

To talk to someone in a higher position of authority instead of directly addressing the person responsible.

While 'head' is used in both, this phrase relates to hierarchy and bypassing channels, not to comprehension.

🔄

Not understand a thing

synonym

To have zero comprehension of something.

This is a more direct and less idiomatic way to express the same complete lack of understanding as 'make head nor tail of'.

🔄

Be baffled

synonym

To be completely confused or perplexed.

This word directly describes the state of confusion that the idiom 'make head nor tail of' conveys.

↔️

Figure out

antonym

To understand or solve something.

This phrase implies successful comprehension or problem-solving, the opposite of being unable to 'make head nor tail of' something.

🔄

It doesn't compute

synonym

It doesn't make sense; it's illogical.

This phrase, often with a slightly robotic or modern feel, expresses that something is illogical and therefore incomprehensible.

↔️

The penny drops

antonym

Suddenly understand something.

This idiom describes the moment of sudden realization or understanding, which is the direct opposite of being unable to make head nor tail of something.

有帮助吗?
还没有评论。成为第一个分享想法的人!

免费开始学习语言