once bitten, twice shy
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idiom

once bitten, twice shy

在一次不愉快的经历之后，你会小心避免它再次发生
Meaning
after an unpleasant experience, you are careful to avoid it happening again
Example
After losing money in the stock market, he became **once bitten, twice shy**.
在股市中失去钱后，他变得**一旦受伤，两次害羞**。
idiom

off the beaten path

做一些不寻常或原创的事情
Meaning
doing something unusual or original
Example
Her ideas are always **off the beaten path**.
她的想法总是**与众不同**。
idiom

once in a while

有时候，但不是很频繁
Meaning
sometimes, but not very often
Example
I enjoy eating out **once in a while**, but I prefer home-cooked meals.
我喜欢偶尔出去吃饭，但我更喜欢家常菜。
idiom

on the radar

正在被监视或考虑的某事
Meaning
something that is being monitored or considered
Example
The new scientific theory is now **on the radar** of researchers across the world.
新的科学理论现在已经**在雷达上**，全球的研究人员都在关注。
idiom

on background

提供给记者的信息，无法归属来源
Meaning
information given to a journalist that cannot be attributed to the source
Example
The official spoke **on background** about the new policy.
官方在**on background**谈论新政策。
idiom

on all fours

用手和膝盖爬行
Meaning
crawling on hands and knees
Example
The baby moved **on all fours** across the floor.
宝宝**四肢着地**在地板上爬行。
idiom

on cloud nine

极度快乐; 欣喜若狂
Meaning
extremely happy; overjoyed
Example
She was **on cloud nine** after getting the job.
她在得到工作后 **云上九**。
idiom

on the market

可供出售
Meaning
available for sale
Example
Their house has been **on the market** for over six months.
他们的房子已经在市场上待了超过六个月。
idiom

on cue

在正确的时刻
Meaning
exactly at the right moment
Example
The dog barked **on cue** when the actor opened the door.
演员一开门，狗狗**准时**叫了。
idiom

olive branch

和平或和解的姿态
Meaning
a gesture of peace or reconciliation
Example
The president extended an **olive branch** by inviting his rival to the summit.
总统通过邀请他的对手参加峰会来伸出**橄榄枝**。
idiom

on the right track

走在通往成功的正确道路上
Meaning
to be going in the correct direction to achieve success
Example
Your plan sounds great — you’re **on the right track**.
你的计划听起来很棒——你走在正确的道路上。
idiom

off the rails

变得失控或混乱
Meaning
to become uncontrolled or chaotic
Example
After his friend moved away, his life went **off the rails**.
他的朋友搬走后，他的生活变得失控。
idiom

on the dot

正好准时；守时
Meaning
exactly on time; punctual
Example
The meeting started **on the dot** at 10 a.m.
会议在早上10点**正好准时**开始。
idiom

off the hook

摆脱某事的指责或责任
Meaning
to be free from blame or responsibility for something
Example
He was **off the hook** after his friend confessed.
在他的朋友承认之后，他摆脱了责任。
idiom

out of the woods

不再处于危险或困难之中
Meaning
no longer in danger or difficulty
Example
She’s recovering now, so she’s **out of the woods**.
她现在正在康复，所以她已经脱离危险。
idiom

on one’s last legs

接近力气或生命的尽头
Meaning
to be near the end of one’s strength or life
Example
After the long hike, we were all **on our last legs**.
经过长时间的徒步旅行后，我们都快撑不住了。
idiom

on the gravy train

处于一种通过少量努力赚取大量金钱的状态
Meaning
to be in a situation where one makes a lot of money with little effort
Example
He’s been riding **on the gravy train** since he took over the family business.
自从接管家族企业以来，他一直在**格雷维火车**上。
idiom

outsmart the algorithm

击败或欺骗使用人工智能或自动化的系统
Meaning
to beat or trick a system that uses AI or automation
Example
People try to **outsmart the algorithm** to boost their posts.
人们试图通过**欺骗算法**来增加他们的帖子曝光。
idiom

Old hat

过时的或不再有趣的东西
Meaning
Something that is outdated or no longer interesting
Example
That style is **old hat** now—no one wears it anymore.
那种风格现在已经过时了——没人再穿它了。
idiom

on the big screen

出现在电影中
Meaning
appearing in a cinema film
Example
Her novel was adapted **on the big screen** last year.
她的小说去年在**大银幕上**改编。
idiom

off the air

停止广播
Meaning
no longer being broadcasted
Example
The show went **off the air** after ten years.
该节目在十年后停止了广播。
idiom

on the front line

直接参与某事中最活跃或最危险的部分
Meaning
directly involved in the most active or dangerous part of something
Example
Doctors were **on the front line** during the pandemic.
在疫情期间，医生们**在前线**。
idiom

off the top of my head

没有太多思考或准备
Meaning
without much thought or preparation
Example
Off the top of my head, I’d say we need more time.
我会说我们需要更多的时间，虽然只是随便说说。
idiom

on edge

感到紧张、烦躁或易怒
Meaning
to be nervous, tense, or irritable
Example
She’s been **on edge** since the exam started.
自从考试开始以来，她一直很紧张。
idiom

on the line

处于危险中；有丢失的风险
Meaning
at risk; in danger of being lost
Example
The company’s reputation is **on the line** after the failed shipment.
在运输失败后，公司的声誉**岌岌可危**。
idiom

One step at a time

逐渐处理任务，而不是一次完成所有的任务。
Meaning
Handle tasks gradually and not all at once.
Example
Don't stress, just take **one step at a time**.
别担心，只需**一步一步来**。
idiom

out with the old, in with the new

用新的东西或想法代替旧的东西
Meaning
to replace old things or ideas with new ones
Example
It's time for **out with the old, in with the new**.
是时候 **告别旧的，迎接新的**。
idiom

out of shape

由于缺乏锻炼而变得不健康或不适合
Meaning
to be unfit or unhealthy due to lack of exercise
Example
I’m so **out of shape** after sitting at a desk all day.
我整天坐在桌子前，完全不健康了。
idiom

out of the blue

出乎意料或没有预警
Meaning
unexpectedly or without warning
Example
My old friend called me **out of the blue** after ten years.
我十年后**突然**接到了老朋友的电话。
idiom

own up

承认或坦白某事
Meaning
to admit or confess to something.
Example
He finally **owned up** to breaking the vase.
他终于**承认**打破了花瓶。
idiom

out of orbit

失去控制; 偏离常规路线
Meaning
beyond control; off the usual path
Example
The project went **out of orbit** after the manager left.
项目在经理离开后**离轨**了。
idiom

on the money

完全正确或准确
Meaning
exactly correct or accurate
Example
His prediction about the stock was **on the money**.
他对股票的预测是 **on the money**。
idiom

offstage

在公众视野之外或私人生活中
Meaning
outside of public attention or in private life
Example
He is very different **offstage** than he appears in his shows.
他在舞台下的表现与他在节目中展现的完全不同。
idiom

once in a blue moon

非常罕见
Meaning
very rarely
Example
I only see him **once in a blue moon**.
我很少见到他。
idiom

open a new chapter

在生活中开始新的阶段或时期
Meaning
to begin a new stage or period in life
Example
Graduating from university **opened a new chapter** in her life.
大学毕业 **开启了她生活的新篇章**。
idiom

on the cutting block

被考虑为淘汰或停止
Meaning
being considered for elimination or discontinuation
Example
Due to budget cuts, several research projects are now **on the cutting block**.
由于预算削减，几个研究项目现在处于被淘汰的边缘。
idiom

offline mode

断开互联网或无法使用的状态
Meaning
a state of being disconnected from the internet or unavailable
Example
He’s been in **offline mode** all weekend, not answering any messages.
他整个周末都处于离线模式，没有回复任何消息。
idiom

out of memory

无法清晰思考；精神上筋疲力尽
Meaning
unable to think clearly; mentally exhausted
Example
After working all night, I was completely **out of memory**.
通宵工作后，我精神上完全筋疲力尽。
idiom

over it

对某事不再感兴趣或受到影响
Meaning
no longer interested or affected by something
Example
I'm totally **over it** now.
我现在完全不在意了。
idiom

on the fast track

在职业或项目中快速进展
Meaning
advancing quickly in a career or project
Example
He is **on the fast track** to becoming a manager.
他正在**快速通道**上成为经理。
idiom

on your plate

需要你处理的责任或工作
Meaning
something that is your responsibility or job to handle
Example
I have too much **on my plate** right now with all the projects.
现在我有太多的事情 **在我的盘子里**，有所有的项目。
idiom

Out of sight, out of mind

当人或事物不可见或不在场时被遗忘。
Meaning
People or things forgotten when not visible or present.
Example
After moving away, our friendship faded—**out of sight, out of mind**.
搬家后，我们的友谊逐渐消退——**眼不见，心不烦**。
idiom

open a Pandora’s box

开始某些会引发许多意外问题的事情
Meaning
to start something that causes many unexpected problems
Example
Unregulated AI development may **open a Pandora’s box** of ethical issues.
未受监管的人工智能开发可能会打开潘多拉的盒子，带来道德问题。
idiom

On the record

正式声明并可报告
Meaning
Officially stated and reportable
Example
She made her statement **on the record** during the interview.
她在面试中做了**正式声明**。
idiom

opt in

选择参与
Meaning
to choose to participate
Example
Employees can **opt in** to the wellness program.
员工可以选择参与健康项目。
idiom

open-hearted

善良和诚实地表达感情
Meaning
kind and honest in expressing feelings
Example
She is an **open-hearted** person who always listens.
她是一个心地善良的人，总是倾听。
idiom

old buddy old pal

一种亲切地称呼老朋友的方式。
Meaning
An affectionate way to refer to a longtime friend.
Example
Hey **old buddy old pal**, long time no see!
嘿，老朋友，好久不见！
idiom

on the tip of one's tongue

当你几乎记得某事但不完全
Meaning
when you can almost remember something but not quite
Example
His name is **on the tip of my tongue**, but I can’t recall it.
他的名字就在我嘴边，但我想不起来。
idiom

On the drawing board

在规划或设计阶段
Meaning
In the planning or design stage
Example
The new product is still **on the drawing board**, but it will be launched next year.
新产品仍然处于设计阶段，但将在明年发布。
idiom

on good terms with

与某人保持友好和积极的关系
Meaning
having a friendly and positive relationship with someone
Example
She’s **on good terms with** her ex-husband for the kids’ sake.
她为了孩子和前夫保持着良好的关系。
idiom

old friend

你认识很久的朋友
Meaning
a friend you have known for a long time
Example
I met an **old friend** from college yesterday.
我昨天遇到了一个大学的老朋友。
idiom

out of the frying pan into the fire

从糟糕的情况进入更糟糕的情况
Meaning
to go from a bad situation to a worse one
Example
Leaving that job was like jumping **out of the frying pan into the fire**.
离开那份工作就像是跳**出火坑进火海**。
idiom

opt out

选择不参与
Meaning
to choose not to participate
Example
Employees can **opt out** of the program if they want.
员工可以选择不参加该程序，如果他们愿意的话。
idiom

on air

现场直播；在电视或广播中播放
Meaning
broadcasting live; being aired on television or radio
Example
The radio show will be **on air** from 7 to 9 PM.
广播节目将在晚上7点到9点**现场直播**。
idiom

on the sly

秘密地; 以狡猾的方式
Meaning
secretly; in a sneaky way
Example
He met her **on the sly** without telling anyone.
他**秘密地**见到她，没告诉任何人。
idiom

on the cutting edge

处于创新或技术的前沿
Meaning
at the forefront of innovation or technology
Example
The laboratory is **on the cutting edge** of artificial intelligence research.
实验室处于人工智能研究的前沿。
idiom

on the fence

对某事感到不确定或犹豫不决
Meaning
undecided or unsure about something
Example
She’s still **on the fence** about moving abroad.
她仍然对是否搬到国外**在围栏上**。
idiom

Out of fashion

不再流行或受欢迎
Meaning
No longer trendy or popular
Example
Those jeans went **out of fashion** years ago.
那些牛仔裤多年前就不流行了。
idiom

out like a light

很快就睡着了
Meaning
to fall asleep very quickly
Example
He was **out like a light** as soon as his head hit the pillow.
他的头一碰到枕头就睡着了。
idiom

on the rise

价值或数量正在增加或增长
Meaning
increasing or growing in value or number
Example
Tech stocks are **on the rise** this quarter.
本季度科技股正在**上涨**。
idiom

off the top of one's head

未经仔细思考或核对就说出某事
Meaning
to say something without thinking carefully or checking
Example
**Off the top of my head**, I think there are five options.
我想，大概有五个选项。
idiom

on the warpath

非常生气并且可能争论或打架
Meaning
very angry and likely to argue or fight
Example
She was **on the warpath** after hearing the bad news.
她听到坏消息后非常生气。
idiom

open heart

在感情和行动上诚实与友善
Meaning
to be honest and kind in feelings and actions
Example
He welcomed everyone with an **open heart**.
他以开诚布公的心欢迎每个人。
idiom

out for blood

极其决心打败或惩罚某人
Meaning
to be extremely determined to defeat or punish someone
Example
After losing last time, the team is **out for blood** this season.
上次输了之后，队伍本赛季决心复仇。
idiom

out of bandwidth

太忙或太累，无法处理更多任务
Meaning
too busy or overwhelmed to handle more tasks
Example
I’m **out of bandwidth** today, can we talk tomorrow?
我今天太忙了，我们明天可以谈吗？
idiom

off the cuff

没有准备的讲话或表演
Meaning
to speak or perform without preparation
Example
He gave an **off the cuff** remark that impressed everyone.
他发表了一个即兴的评论，给大家留下了深刻印象。
idiom

on the witness stand

在法庭上作证
Meaning
to be giving testimony in court
Example
The victim was nervous while **on the witness stand**.
受害者在证人席上很紧张。
idiom

one in a million

非常特别或稀有
Meaning
very special or rare
Example
Her kindness makes her **one in a million**.
她的善良使她成为**百万分之一**。
idiom

Out of curiosity

出于想要知道或学习某事的愿望。
Meaning
Because of a desire to know or learn something.
Example
I asked him **out of curiosity**, not to interfere.
我出于**好奇**问了他，而不是为了干涉。
idiom

on top of the world

感到非常快乐和成功
Meaning
to feel extremely happy and successful
Example
After winning the award, he felt **on top of the world**.
在赢得奖项后，他觉得自己是世界之巅。
idiom

on the stand

作为证人在法庭上作证
Meaning
testifying as a witness in court
Example
She was nervous when she was **on the stand**.
她在 **证人席** 上时感到很紧张。
idiom

on the go

总是忙碌或活跃；经常旅行
Meaning
always busy or active; traveling a lot
Example
She's always **on the go** with her work trips.
她总是忙于工作旅行。
idiom

on thin ice

处于危险或危险的境地
Meaning
in a risky or dangerous situation
Example
You are **on thin ice** with that behavior.
你因那种行为而**处于险境**。
idiom

on the rebound

在分手后不久开始一段新的关系
Meaning
starting a new relationship soon after a breakup
Example
He started dating again **on the rebound**.
他再次开始约会 **昂 迪 利宝德**。
idiom

out of one’s comfort zone

做一些不熟悉或具有挑战性的事情
Meaning
doing something unfamiliar or challenging
Example
She stepped **out of her comfort zone** to take a new job.
她走出舒适区去接受一份新工作。
idiom

Old school

拥有传统的观念或价值观；不现代
Meaning
Having traditional ideas or values; not modern
Example
My father still prefers handwritten letters; he’s really **old school**.
我父亲仍然更喜欢手写信件；他真的是老派。
idiom

out of the box

富有创意，与通常的想法不同
Meaning
creative and different from usual ideas
Example
Her **out of the box** marketing strategy increased sales rapidly.
她的**out of the box**营销策略迅速提高了销售额。
idiom

online presence

一个人或企业在互联网上的存在和活动
Meaning
the existence and activity of a person or business on the internet
Example
A strong **online presence** is essential for digital marketing.
强大的**在线存在**对于数字营销至关重要。
idiom

open Pandora’s box

开始做会引发许多意想不到问题的事情
Meaning
to start something that causes many unforeseen problems
Example
Creating sentient AI could **open Pandora’s box** of ethical challenges.
创造有感知的人工智能可能会打开伦理挑战的潘多拉盒子。
idiom

off script

偏离预定的计划或演讲
Meaning
to deviate from a prepared plan or speech
Example
During the meeting, he went **off script** and made some bold statements.
在会议期间，他**离开剧本**并做出了一些大胆的陈述。
idiom

outside the box

以不寻常或非常规的方式思考或行动
Meaning
thinking or acting in an unusual or unconventional way
Example
To solve this problem, we need to think **outside the box**.
为了解决这个问题，我们需要**跳出框框**思考。
idiom

on the stump

为政治职位竞选，特别是在公共场合发表演讲
Meaning
to campaign for political office, especially by giving speeches in public
Example
The candidate has been **on the stump** for weeks, rallying support across the country.
候选人已经在**竞选**了几个星期，在全国各地争取支持。
idiom

over the hill

过了巅峰期；不再年轻或处于最佳状态
Meaning
past one's prime; no longer young or at peak performance
Example
Some people think turning forty means you’re **over the hill**, but that’s not true.
有些人认为四十岁意味着你已经**过气了**，但事实并非如此。
idiom

own it

为你是谁或你做的事而感到骄傲
Meaning
to take pride in who you are or what you do
Example
Don’t be shy about your success—**own it**!
不要因你的成功而感到害羞——**自豪吧**！
idiom

open one's heart

真诚地表达感受或情感
Meaning
to express feelings or emotions honestly
Example
She finally decided to **open her heart** and share her feelings.
她终于决定**敞开心扉**，分享她的感受。
idiom

out of your mind

疯狂或极度担心
Meaning
crazy or extremely worried
Example
You must be **out of your mind** to drive that fast!
你一定是**疯了**，开这么快！
idiom

own up to your mistakes

承认你做错了事
Meaning
to admit that you have done something wrong
Example
It takes courage to **own up to your mistakes**.
承认自己的错误需要勇气。
idiom

Open book

一个容易理解或透明的人
Meaning
Someone who is easy to understand or transparent.
Example
She’s an **open book**; you always know what she’s thinking.
她是一本**open book**; 你总是知道她在想什么。
idiom

open up about

分享个人的想法或感受
Meaning
to share personal thoughts or feelings
Example
He finally **opened up about** the project stress.
他终于谈到了项目压力。
idiom

on the house

免费；由店家招待
Meaning
free of charge; paid for by the establishment
Example
The drinks were **on the house** tonight.
今晚的饮料是店家请客的。
idiom

on the level

诚实和真诚; 不试图欺骗
Meaning
honest and sincere; not trying to deceive
Example
You can trust her—she’s **on the level**.
你可以信任她—她非常诚实。
idiom

out of left field

某事出乎意料或令人惊讶
Meaning
something unexpected or surprising
Example
His question came **out of left field** and shocked everyone.
他的提问**out of left field**，让所有人都感到震惊。
idiom

out of this world

极其好或令人印象深刻
Meaning
extremely good or impressive
Example
The food at that restaurant is **out of this world**.
那家餐厅的食物令人赞叹。
idiom

On the breadline

生活在贫困中或几乎没有钱。
Meaning
Living in poverty or with very little money.
Example
After losing his job, he was almost **on the breadline**.
失业后，他几乎处于**安德布雷德莱恩**状态。
idiom

on one's shoulders

承担某事的责任或负担
Meaning
having the responsibility or burden of something
Example
The success of the project is **on his shoulders**.
项目的成功**落在他肩上**。
idiom

On the clock

工作中，通常有严格的时间限制或截止日期。
Meaning
Working, often with a strict time limit or deadline.
Example
I’m **on the clock** today, so I can’t waste any time.
我今天**在上班**，所以不能浪费时间。
idiom

on the beat

警察的常规巡逻路线
Meaning
a police officer's regular patrol route
Example
The officer was **on the beat** when he spotted the suspect.
当警官在巡逻时，他发现了嫌疑人。
idiom

out of one’s mind

疯狂或极度担忧
Meaning
crazy or extremely worried
Example
He must be **out of his mind** to drive so fast in the rain.
他一定是**疯了**，才会在雨中开车这么快。
idiom

Out of one’s depth

处于一种过于难以理解或应对的情况。
Meaning
To be in a situation that is too difficult to understand or deal with.
Example
I felt **out of my depth** in that technical discussion.
在那次技术讨论中，我感到**超出我的深度**。
idiom

out of the picture

不再涉及或相关
Meaning
no longer involved or relevant
Example
After the gallery closed, the curator was **out of the picture**.
画廊关闭后，策展人不再是其中的一部分。
idiom

Out of focus

不清楚或不专心
Meaning
Not clear or not paying attention
Example
He looked tired and completely **out of focus** during the meeting.
他在会议期间看起来很累，完全没有集中注意力。
idiom

on fire

表现非常好；充满能量和成功
Meaning
performing very well; full of energy and success
Example
The sales team is **on fire** this month!
销售团队这个月表现出色！
idiom

on the same wavelength

与某人以相似的方式思考
Meaning
to think in a similar way as someone else
Example
My best friend and I are always **on the same wavelength**.
我和我最好的朋友总是保持同样的思路。
idiom

off the top of your head

在没有深入思考或准备的情况下说某事
Meaning
to say something without deep thinking or preparation
Example
I can’t remember the exact number **off the top of my head**.
我不能记得准确的数字 **脱口而出**
idiom

on good terms

保持友好和平的关系
Meaning
to have a friendly and peaceful relationship
Example
They are still **on good terms** even after the breakup.
他们即使分手后仍然关系很好。
idiom

overnight success

一个人或物品非常快速地变得成功
Meaning
a person or thing that becomes successful very quickly
Example
Her first song made her an **overnight success**.
她的第一首歌让她成为了**一夜成名**。
idiom

on shaky ground

在不确定或不稳定的情况下
Meaning
in an uncertain or unstable situation
Example
His business is **on shaky ground** after the market crash.
他的生意在市场崩溃后**岌岌可危**。
idiom

on the mend

从疾病或受伤中恢复
Meaning
recovering from an illness or injury
Example
I was sick last week, but I’m **on the mend** now.
我上周生病了，但现在正在恢复中。
idiom

offbeat

不寻常；不同于常规
Meaning
unusual; different from the norm
Example
His **offbeat** sense of humor makes everyone laugh.
他的**离经叛道**幽默让每个人都笑了。
idiom

own up to

承认或坦白你做错的事情
Meaning
to admit or confess to something you did wrong
Example
She finally **owned up to** breaking the vase.
她最终**承认**打破了花瓶。
idiom

on the run

试图避开警察的追捕
Meaning
trying to avoid being caught by the police
Example
The suspect has been **on the run** for three days.
嫌疑人已经**on the run**三天了。
idiom

out of your league

太好或太强大，无法竞争
Meaning
too good or powerful to compete with
Example
That company is **out of our league** in terms of resources.
这家公司在资源方面超出了我们的竞争范围
idiom

on the ball

机警、聪明并且反应迅速
Meaning
alert, smart, and quick to react
Example
You need to be **on the ball** to handle this job.
你需要非常机警才能处理这份工作。
idiom

open and shut case

一个容易决定或显而易见的案件
Meaning
a case that is easily decided or obvious
Example
It was an **open and shut case** with clear evidence.
这是一个有明确证据的显而易见的案件。
idiom

off to a flying start

以非常成功的方式开始某事，像旅行一样
Meaning
to begin something, like a journey, very successfully
Example
Our trip was **off to a flying start** with perfect weather.
我们的旅行以完美的天气顺利开始。
idiom

Opportunity knocks but once

好机会很少出现，出现时应该把握。
Meaning
Good opportunities are rare and should be seized when they appear.
Example
Don't miss the chance, **opportunity knocks but once**.
不要错过机会，**机会只敲一次门**。
idiom

own your mistakes

对自己犯的错误承担责任。
Meaning
to take responsibility for what you did wrong.
Example
It’s important to **own your mistakes** and learn from them.
重要的是要**承担自己的错误**并从中学习。
idiom

off the beaten track

在一个很少有人去的地方；偏远或不寻常
Meaning
in a place not visited by many people; remote or unusual
Example
We found a lovely beach **off the beaten track**.
我们发现了一个美丽的海滩，远离人群。
idiom

own up to something

承认或坦白对某事负责
Meaning
to admit or confess responsibility for something
Example
You should **own up to your mistakes** instead of blaming others.
你应该**承认你的错误**，而不是责怪别人。
idiom

Open-minded

愿意考虑新的想法或意见。
Meaning
Willing to consider new ideas or opinions.
Example
A good therapist must be **open-minded**.
一个好的治疗师必须**思想开放**。
idiom

out of balance

感觉精神或情感上不稳定
Meaning
to feel mentally or emotionally unstable
Example
Lack of rest can make you feel **out of balance**.
缺乏休息可能会让你感到失衡。