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idiom

narrow down to

将选择范围缩小到更少的数量
Meaning
to reduce choices to a smaller number
Example
We’ve **narrowed it down to** three finalists.
我们已经把范围缩小到三位决赛选手。
idiom

break a promise

违背承诺
Meaning
to fail to do what one promised
Example
She **broke her promise** and didn’t call him.
她违背了承诺，没有给他打电话。
idiom

join forces

为了共同的目标而联合起来
Meaning
to combine efforts with others for a common purpose
Example
Two companies **joined forces** to create a better product.
两家公司联合起来创造出更好的产品。
idiom

blow your mind

极大地打动或震撼某人
Meaning
to impress or amaze someone greatly
Example
The new AI technology will **blow your mind**.
新的人工智能技术将让你震惊。
idiom

beyond the pale

超出可接受的规则或标准
Meaning
outside acceptable rules or standards
Example
His behavior was **beyond the pale**.
他的行为超出了可接受的范围。
idiom

go with your gut

在做决策时相信你的直觉
Meaning
to trust your instinct when making a decision
Example
Sometimes you just have to **go with your gut**.
有时候你只需要**相信你的直觉**。
idiom

justice is blind

司法应当公正，不受财富或权力影响
Meaning
justice should be impartial and not influenced by wealth or power
Example
**Justice is blind**, and everyone should be treated equally under the law.
**司法是盲目的**，每个人都应在法律下得到平等对待
idiom

give thanks

表达感激
Meaning
to express gratitude
Example
We should always **give thanks** for what we have.
我们应该永远**感恩**我们所拥有的。
idiom

law and order

通过遵守法律维护的和平状态
Meaning
a state of peace maintained by following laws
Example
The police are responsible for maintaining **law and order**.
警察负责维护**法与秩序**。
idiom

give ground

在讨论中做出让步或妥协
Meaning
to make concessions or yield in a discussion
Example
He finally **gave ground** on the pricing issue.
他最终在定价问题上**让步**了。
idiom

divide and conquer

通过引起他人之间的分歧来获得控制
Meaning
to gain control by causing disagreement among others
Example
The dictator used a **divide and conquer** strategy to maintain power.
独裁者使用了**分而治之**战略来维持权力。
idiom

gather up

把东西收集起来
Meaning
to collect things together
Example
Let’s **gather up** the supplies before the workshop.
我们在研讨会前把用品收集起来吧。
idiom

trust issues

由于过去的经历，难以信任他人
Meaning
difficulty trusting others due to past experiences
Example
He has **trust issues** after being betrayed once.
他在被背叛一次后有了**信任问题**。
idiom

hush-hush

保密或非常机密
Meaning
kept secret or very confidential
Example
The project is still **hush-hush**, so don’t mention it.
该项目仍然保密，所以不要提到它。
idiom

sweep under the rug

隐藏或忽视问题而不是解决它们
Meaning
to hide or ignore problems instead of solving them
Example
You can’t just **sweep problems under the rug** forever.
你不能永远把问题扫到地毯下面。
idiom

take a deep breath

冷静下来并放松
Meaning
to calm down and relax
Example
**Take a deep breath** before reacting.
在反应之前，先**深呼吸**一下。
idiom

the internet of things (IoT)

将日常物品连接到互联网以发送和接收数据
Meaning
the connection of everyday objects to the internet to send and receive data
Example
Smart homes are part of the **internet of things (IoT)**, where devices are interconnected.
智能家居是**物联网 (IoT)**的一部分，设备之间相互连接。
idiom

take the fall

为某事承担责任，通常是为了保护他人。
Meaning
to accept blame for something, often to protect others.
Example
He agreed to **take the fall** for the team’s mistake.
他同意为团队的错误**承担责任**。
idiom

put heads together

一起合作解决问题
Meaning
to work together to solve a problem
Example
Let’s **put our heads together** and find a solution.
让我们**集思广益**，找到解决方案。
idiom

hang back

留在后面或犹豫不决
Meaning
to remain behind or hesitate to act
Example
If you **hang back**, you might miss the opportunity.
如果你留在后面，你可能会错失机会。
idiom

go through the motions

做事没有热情
Meaning
to do something without enthusiasm
Example
He’s just **going through the motions** at work.
他在工作中只是走过场。
idiom

ink in

以书面形式安排或确认某事
Meaning
to schedule or confirm something in writing
Example
I’ll **ink in** the interview for Tuesday morning.
我将安排周二早上的面试。
idiom

come into one's own

达到成熟或充分发挥潜力
Meaning
to reach a stage of maturity or full potential
Example
She really **came into her own** after starting her own business.
她在开始自己的事业后真正发挥了全部潜力。
idiom

At your own risk

你对任何可能的危险或损失负责。
Meaning
You are responsible for any possible danger or loss.
Example
You can enter the cave, but it’s **at your own risk**.
你可以进入洞穴，但这是**自担风险**。
idiom

Born in the barn

有坏习惯或缺乏社交礼仪。
Meaning
To have bad manners or lack social etiquette.
Example
Close the door! Were you **born in the barn**?
关上门！你是在谷仓里出生的吗？
idiom

Heart full of gratitude

深深感激和欣赏。
Meaning
Deeply thankful and appreciative.
Example
She spoke with a **heart full of gratitude** for her teachers.
她带着**心满感激**的话语谈论她的老师。
idiom

to firewall something

阻止或防止访问某物，通常在保护网络或系统的上下文中使用
Meaning
to block or prevent access to something, typically used in the context of protecting a network or system
Example
We need **to firewall something** to protect our database from hackers.
我们需要 **to firewall something** 来保护我们的数据库免受黑客攻击。
idiom

get to the bottom of it

找出事情的真正原因或根源
Meaning
to find the real reason or cause of something
Example
Let’s **get to the bottom of it** before making any decision.
在做任何决定之前，让我们先找出事情的真正原因。
idiom

latch onto

快速接受一个想法或与某人建立联系。
Meaning
to quickly embrace an idea or connect with someone
Example
The students quickly **latched onto** the new study app.
学生们迅速接受了新的学习应用。
idiom

raring to go

非常渴望或兴奋地开始某事
Meaning
very eager or excited to start something
Example
Everyone was **raring to go** when the event started.
活动开始时，每个人都非常兴奋。
idiom

born in the purple

出生于富裕或皇室家庭
Meaning
born into a wealthy or royal family
Example
He was **born in the purple**, so wealth was never an issue.
他出生于皇室家庭，因此财富从未是问题。
idiom

brush past

轻轻接触并迅速经过某人或某物
Meaning
to move quickly by someone or something with slight contact
Example
He **brushed past** the reporters without stopping.
他**轻轻地擦过**记者们没有停下来。
idiom

to err is human

每个人都会犯错误；不完美是自然的
Meaning
everyone makes mistakes; it’s natural to be imperfect
Example
**To err is human**, but to learn from errors is wisdom.
犯错是人类的本性，但从错误中学习就是智慧
idiom

phase out

逐渐停止使用或提供某物
Meaning
to gradually stop using or providing something
Example
The company plans to **phase out** plastic packaging by next year.
该公司计划在明年之前逐渐停止使用塑料包装。
idiom

raining cats and dogs

下大雨
Meaning
raining very heavily
Example
It's **raining cats and dogs** outside!
外面正在**下倾盆大雨**!
idiom

to get bent out of shape

变得生气或心烦
Meaning
to become angry or upset
Example
Don't **get bent out of shape** over a small mistake.
不要因为小错误而生气。
idiom

bat around

随意讨论想法
Meaning
to discuss ideas casually
Example
We spent the afternoon **batting around** marketing themes.
我们花了一下午的时间讨论营销主题。
idiom

take the stand

在法庭上作证
Meaning
to testify in court
Example
The witness will **take the stand** tomorrow morning.
证人明天早上将在法庭上作证。
idiom

human in the loop

一个积极参与监控或控制自动化过程的人
Meaning
a person actively involved in monitoring or controlling an automated process
Example
Even in AI systems, a **human in the loop** ensures ethical decisions.
即使在人工智能系统中，**人类在环中**也能确保做出道德决策。
idiom

a run on the bank

由于担心银行倒闭，许多人从银行提取他们的钱
Meaning
a situation where many people withdraw their money from a bank due to fear of collapse
Example
Rumors of insolvency caused **a run on the bank**.
破产的传闻引发了**银行挤兑**。
idiom

Flying blind

在没有足够的信息或指导下采取行动。
Meaning
To act without sufficient information or guidance.
Example
Without proper data, we're **flying blind** on this project.
没有适当的数据，我们在这个项目中**盲目进行**。
idiom

hammer out a deal

经过长时间讨论达成协议
Meaning
to reach an agreement after long discussion
Example
They spent hours to **hammer out a deal** that satisfied both sides.
他们花了几个小时来**达成协议**，以便让双方都满意。
idiom

check back in

稍后再次联系以获取更新
Meaning
to reconnect later to get an update
Example
Let’s **check back in** next week on the prototype.
我们下周再检查原型。
idiom

brainstorm an idea

讨论并创造性地思考，以产生新的想法
Meaning
to discuss and think creatively to generate new ideas
Example
The teacher asked the class to **brainstorm ideas** for the project.
老师要求班级为项目**头脑风暴想法**。
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

in the same frame

拥有共同的视角或理解
Meaning
having a shared perspective or understanding
Example
Before we start, we need to make sure everyone is **in the same frame**.
在我们开始之前，我们需要确保每个人都**在同一框架中**。
idiom

get straight to the point

直接谈论主要话题
Meaning
to talk directly about the main topic
Example
Let's **get straight to the point** and discuss the issue.
让我们**直奔主题**并讨论这个问题。
idiom

A rising tide lifts all boats

当经济改善时，每个人都会在某种程度上受益。
Meaning
When the economy improves, everyone benefits to some extent.
Example
When the new policies boosted trade, people said that **a rising tide lifts all boats**.
当新政策促进了贸易时，人们说：“水涨船高”。
idiom

crash and burn

彻底或突然失败
Meaning
to fail completely or suddenly
Example
The new software update **crashed and burned** after launch.
新的软件更新在发布后**彻底失败了**。
idiom

robotic process automation

使用人工智能自动化业务流程
Meaning
the use of AI to automate business processes
Example
Companies are embracing **robotic process automation** to reduce costs.
公司正在采用**机器人过程自动化**来降低成本。
idiom

get the hang of it

学习或掌握某件新事物
Meaning
to learn or become skilled at something new
Example
Don’t worry, you’ll **get the hang of it** soon.
别担心，你很快就能 **掌握它**。
idiom

be at the helm

负责或控制某事
Meaning
to be in charge of or control something
Example
He was **at the helm** of the company when it became successful.
他在公司成功时**掌舵**。
idiom

Apple of my eye

某人你深深地爱着。
Meaning
Someone you love dearly.
Example
Her son is the **apple of her eye**.
她的儿子是她的**眼中钉**。
idiom

scoop the news

第一个报道重要新闻
Meaning
to be the first to report an important piece of news
Example
The local newspaper **scooped the news** about the mayor's resignation.
当地报纸**抢先报道**了市长的辞职消息。
idiom

dress down

严厉地责骂某人
Meaning
to scold someone severely
Example
The coach **dressed down** the team for sloppy defense.
教练因防守不力而严厉地责骂了球队。
idiom

upgrade your mindset

让自己的思维方式适应现代的变化或创新
Meaning
to adapt one’s thinking for modern changes or innovation
Example
In the age of AI, it’s vital to **upgrade your mindset**.
在人工智能时代，**升级你的思维方式**非常重要。
idiom

do the right thing

以道德或社会责任的方式行事
Meaning
to act in a morally or socially responsible way
Example
Even when it’s hard, always **do the right thing**.
即使很困难，始终做正确的事。
idiom

be above board

以诚实和公开的方式行事
Meaning
to act in an honest and open manner
Example
She is always **above board** in all her dealings.
她在所有的交易中总是**诚实**。
idiom

The light at the end of the tunnel

在漫长困难时期后的希望的象征。
Meaning
A sign of hope after a long period of difficulty.
Example
After months of hard work, we finally saw **the light at the end of the tunnel**.
经过数月的努力工作后，我们终于看到了隧道尽头的光。
idiom

couldn’t care less

表现出完全的冷漠
Meaning
to show total indifference
Example
She **couldn’t care less** about what people think.
她对别人怎么想完全不在乎。
idiom

how’s it going

一种非正式的询问某人状况的方式
Meaning
a casual way of asking how someone is doing
Example
**How’s it going?** You look great today!
**怎么样？** 你今天看起来真棒！
idiom

out of bounds

不允许或超出可接受的限制
Meaning
not allowed or beyond acceptable limits
Example
His rude comment was **out of bounds**.
他的粗鲁评论超出了界限
idiom

hold someone accountable

让某人对他们的行为负责
Meaning
to make someone take responsibility for their actions
Example
It’s important to **hold people accountable** for their mistakes.
让人们为他们的错误负责是很重要的。
idiom

Go to pieces

失去对情绪的控制；崩溃。
Meaning
To lose control of your emotions; to break down.
Example
She **went to pieces** after hearing the bad news.
她在听到坏消息后**崩溃了**。
idiom

spill your guts

向某人倾诉自己所有的私人感情或秘密
Meaning
to tell someone all your private feelings or secrets
Example
After a few drinks, he started to **spill his guts** about his failed marriage.
喝了几杯之后，他开始倾诉自己失败婚姻的所有事情。
idiom

an out of this world experience

一种非凡或特殊的经历
Meaning
an extraordinary or exceptional experience
Example
The view from the space station was truly **an out of this world experience**.
从空间站看到的景象真是**一种超凡的经历**。
idiom

beat the algorithm

找到一种方法来智取或绕过系统的逻辑
Meaning
to find a way to outsmart or bypass a system's logic
Example
Marketers always try to **beat the algorithm** for better reach.
营销人员总是尝试**击败算法**以获得更好的覆盖范围。
idiom

behind enemy lines

处于敌对或危险的情况中
Meaning
in a hostile or dangerous situation
Example
Journalists were working **behind enemy lines** to report the truth.
记者们在敌人的防线后工作，以报道真相。
idiom

Keep someone posted

让某人了解某事。
Meaning
To keep someone informed about something.
Example
Please **keep me posted** about any updates.
请**保持我更新**任何最新的进展。
idiom

cut and paste solution

一个简单或没有创意的解决办法；复制的方法
Meaning
an easy or unoriginal fix; a copied approach
Example
That’s just a **cut and paste solution**, not a real fix.
那只是一个复制粘贴的解决方案，不是真正的解决办法。
idiom

recharge your batteries

休息并恢复能量
Meaning
to rest and regain energy
Example
I took a vacation to **recharge my batteries**.
我度假是为了**充电**。
idiom

on the same playing field

在相同的条件下或具有相等的机会
Meaning
in the same conditions or with equal chances
Example
We’re now **on the same playing field** as our competitors.
我们现在与我们的竞争对手站在同一起跑线上。
idiom

have steam coming out of your ears

明显非常生气
Meaning
to be visibly very angry
Example
He had **steam coming out of his ears** when he saw the damage.
他看到损坏后，**气得发红**。
idiom

gear toward

为特定群体设计或瞄准某物
Meaning
to design or aim something for a particular group
Example
The course is **geared toward** new managers.
课程是**面向**新经理的。
idiom

bent over backwards

非常努力地帮助或取悦某人
Meaning
to try very hard to help or please someone
Example
She **bent over backwards** to make sure everyone was happy.
她**弯腰后仰**确保每个人都很高兴。
idiom

between a rock and a hard place

面临两个困难的选择
Meaning
facing two difficult choices
Example
She’s **between a rock and a hard place** — neither option is good.
她处于两难境地——没有哪个选项是好的。
idiom

tomorrow is another day

你可以明天重新开始
Meaning
you can start fresh again tomorrow
Example
Don’t worry about your mistakes, **tomorrow is another day**.
别担心你的错误，明天是新的一天。
idiom

born poor, die rich

从贫穷开始，但通过努力工作变得富有
Meaning
to start life poor but become rich through hard work
Example
He’s the kind of man who wants to **born poor, die rich**.
他是那种想要**从贫穷出生，死时富有**的人。
idiom

mix up

混淆两种或更多事物
Meaning
to confuse two or more things
Example
I always **mix up** their names during meetings.
我总是在会议中混淆他们的名字。
idiom

fail fast, learn faster

快速识别错误并将其用作学习机会
Meaning
to quickly identify mistakes and use them as learning opportunities
Example
In startup culture, it’s encouraged to **fail fast, learn faster**.
在初创公司文化中，鼓励**失败快，学习更快**。
idiom

mull over

仔细思考某事
Meaning
to think carefully about something
Example
Take a day to **mull over** the offer.
花一天时间仔细思考这个提议。
idiom

in two minds

犹豫不决
Meaning
undecided about something
Example
I'm **in two minds** about accepting the new job offer.
我**犹豫不决**是否接受新的工作邀请。
idiom

turn the other cheek

忽视侮辱或避免复仇
Meaning
to ignore insults or avoid taking revenge
Example
He chose to **turn the other cheek** instead of fighting back.
他选择了**转过另一边脸**而不是反击。
idiom

Stay on track

继续做正确的事情以实现你的目标。
Meaning
To continue doing the right thing to reach your goal.
Example
We need to **stay on track** to meet our deadline.
我们需要**保持正轨**以完成我们的截止日期。
idiom

light up someone’s day

让某人开心
Meaning
to make someone happy
Example
Your kind words **lighted up my day**.
你的友善话语照亮了我的一天。
idiom

hang loose

放松并轻松对待事情
Meaning
to relax and take things easy
Example
We’re on vacation, so just **hang loose** and enjoy.
我们在度假，所以放松并享受吧。
idiom

paint a vision

清晰地描述一个激励人心的未来目标
Meaning
to clearly describe an inspiring future goal
Example
The leader **painted a vision** of a better, more connected world.
领导者描绘了一个更好、更互联的世界的愿景。
idiom

soft sell

一种没有压力的微妙且有说服力的销售方式
Meaning
a subtle and persuasive way of selling without pressure
Example
They used a **soft sell** strategy to gain customer trust.
他们使用了一种**软卖**策略来获得客户的信任。
idiom

go up in smoke

完全失败; 什么都没得到
Meaning
to fail completely; to come to nothing
Example
All his dreams **went up in smoke** after the deal collapsed.
在交易失败后，他所有的梦想**化为乌有**。
idiom

reap what you sow

你得到你行为的结果，无论好坏
Meaning
you get the results of your actions, good or bad
Example
If you’re kind to others, you’ll **reap what you sow**.
如果你对别人友善，你将收获你所播种的。
idiom

growth hacking

使用创造性和低成本的策略迅速发展业务或产品
Meaning
using creative and low-cost strategies to rapidly grow a business or product
Example
Startups rely heavily on **growth hacking** to gain users quickly.
初创公司在很大程度上依赖**growth hacking**来快速获得用户。
idiom

Take it easy

放松，不要太担心。
Meaning
To relax and not worry too much.
Example
**Take it easy**, everything will be fine.
放松，一切都会好起来的。
idiom

speak out

大胆而公开地表达意见
Meaning
to express an opinion openly and boldly
Example
Employees are encouraged to **speak out** about improvements.
鼓励员工就改进措施**大胆地发表**意见。
idiom

move the goalposts

改变规则或条件使成功变得更加困难
Meaning
to change the rules or conditions to make success harder
Example
They **moved the goalposts** after we had agreed on the terms.
他们在我们已经达成条款后**移动了球门**。
idiom

hit rock bottom

跌入谷底；到达失败或抑郁的最低点
Meaning
to reach the lowest point of failure or depression
Example
After losing his job, he **hit rock bottom**.
失去工作后，他**跌入了谷底**。
idiom

go for the jugular

攻击某人的最脆弱点
Meaning
to attack someone's most vulnerable point
Example
During the debate, he **went for the jugular**.
在辩论中，他**直指要害**。
idiom

give someone a dose of their own medicine

以同样糟糕的方式对待某人，就像他们对待别人一样
Meaning
to treat someone the same bad way they treated others
Example
He was rude to everyone, so I **gave him a dose of his own medicine**.
他对每个人都很粗鲁，所以我**给了他一剂自己的药**。
idiom

cash in on

从某个情况中获利，通常很快
Meaning
to profit from a situation, often quickly
Example
Several startups tried to **cash in on** the sudden trend.
几个初创公司试图从突如其来的趋势中获利。
idiom

Spread joy

通过友善或快乐使他人幸福
Meaning
to make others happy by being kind or cheerful
Example
It's important to **spread joy** wherever you go.
无论你走到哪里，**传播喜悦**都是很重要的。
idiom

down on one’s luck

经历一段坏运气
Meaning
to be experiencing a period of bad luck
Example
He’s **down on his luck** and can’t find a job.
他正在经历一段坏运气，找不到工作。
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

mark down

降低某物的价格
Meaning
to reduce the price of something
Example
The store **marked down** winter coats in March.
商店在三月**降价**了冬季大衣。
idiom

wrap up

完全完成某事
Meaning
to finish something completely
Example
We need to **wrap up** the report before lunch.
我们需要在午餐前完成报告。
idiom

in full color

以极大的细节和生动性
Meaning
in great detail and vividness
Example
The documentary showed the event **in full color**.
纪录片展示了事件 **以极大的细节和生动性**。
idiom

settle in

在新环境或新地方适应
Meaning
to become comfortable in a new place or situation
Example
It took a week to **settle in** after the move.
搬家后，我们花了一周时间适应。
idiom

influencer marketing

通过社交媒体上的有影响力的人来推广产品
Meaning
promoting products through influential people on social media
Example
Many brands invest in **influencer marketing** to reach younger audiences.
许多品牌投资于**网红营销**，以接触更年轻的观众。
idiom

feel on top of the world

感到非常快乐和健康
Meaning
to feel very happy and healthy
Example
After recovering from the flu, I **felt on top of the world**.
从流感恢复后，我感到像是站在世界之巅。
idiom

serenity now

在压力大的情况下用来唤起冷静的短语
Meaning
a phrase used to invoke calmness, usually in a stressful situation
Example
Whenever I feel stressed, I remind myself to say **serenity now**.
每当我感到压力时，我会提醒自己说 **宁静现在**。
idiom

get the show on the road

开始一项活动或旅程
Meaning
to begin an activity or journey
Example
Let’s **get the show on the road** and start our trip.
让我们开始旅程吧。
idiom

Keep one’s eye on the ball

专注于实现目标。
Meaning
To stay focused on achieving a goal.
Example
If you **keep your eye on the ball**, you’ll surely succeed.
如果你专注于目标，你一定会成功。
idiom

school someone in something

教某人一门学科或技能
Meaning
to teach someone about a subject or skill
Example
He **schooled me in** the basics of computer programming.
他教了我计算机编程的基础。
idiom

A giant leap

一个重要的进步或成就。
Meaning
A significant advancement or achievement.
Example
Landing on the moon was **a giant leap** for mankind.
登月是人类的一大飞跃。
idiom

wear out

使用某物直到它变得无法使用
Meaning
to use something until it becomes unusable
Example
You’ll **wear out** those shoes if you hike every weekend.
如果你每个周末都去远足，你会**磨损**这些鞋子。
idiom

have a chip on your shoulder

因过去的事情而生气或怀恨
Meaning
to be angry or resentful about something from the past
Example
He **has a chip on his shoulder** about being rejected.
他因为被拒绝而心怀怨恨。
idiom

make friends

交朋友
Meaning
to form new friendships
Example
It’s easy to **make friends** when you’re kind to others.
当你对别人友善时，很容易**交朋友**。
idiom

all in good time

一切都会按时发生；保持耐心
Meaning
something will happen eventually; be patient
Example
**All in good time**, you’ll see the results soon.
一切都会按时发生，你很快就能看到结果。
idiom

Know it all

一个表现得像是知道一切的人。
Meaning
Someone who acts as if they know everything.
Example
He’s such a **know it all**, it’s annoying.
他是一个**自以为是的人**，这让人讨厌。
idiom

open up

变得愿意分享想法或开始操作
Meaning
to become willing to share thoughts or to start operating
Example
He finally **opened up** about the challenges he’s facing.
他终于开始谈论他面临的挑战。
idiom

come out of one's shell

变得更外向或更自信
Meaning
to become more outgoing or confident
Example
She used to be shy, but now she has finally **come out of her shell**.
她以前很害羞，但现在她终于**走出了她的壳**。
idiom

In the know

拥有大多数人没有的信息。
Meaning
Having information that most people do not have.
Example
She’s always **in the know** about company secrets.
她总是知道公司机密。
idiom

split personality

一个人有两个非常不同的性格面
Meaning
having two very different sides to one's character
Example
He’s got a **split personality**—sometimes kind, sometimes cruel.
他有一个**分裂的个性**—有时友善，有时残忍。