book smart
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idiom

book smart

从学习中获得知识而不是从经验中获得的人
Meaning
knowledgeable from studying rather than experience
Example
He’s **book smart** but lacks practical experience.
他很有书本知识，但缺乏实际经验。
idiom

brain like a sieve

记忆力非常差
Meaning
having a very bad memory
Example
I keep forgetting things—I’ve got a **brain like a sieve**!
我总是忘记事情——我有一个**像筛子一样的大脑**！
idiom

big-hearted

非常友善和慷慨
Meaning
very kind and generous
Example
He is known as a **big-hearted** man.
他被认为是一个**心地善良**的人。
idiom

Batten down the hatches

为困难或危险的情况做好准备。
Meaning
To prepare for a difficult or dangerous situation.
Example
We’d better **batten down the hatches**; a storm is coming.
我们最好做好准备；风暴来了。
idiom

blossom into something

随着时间的推移发展或变得成功
Meaning
to develop or become successful over time
Example
She **blossomed into** a confident and skilled leader.
她变成了一个自信且熟练的领导者。
idiom

back up

支持或备份重要数据
Meaning
to support or to make a copy of important data
Example
Can you **back up** my explanation during the meeting?
你能在会议期间支持我的解释吗？
idiom

break the clutter

在拥挤或竞争激烈的市场中脱颖而出
Meaning
to stand out in a crowded or competitive market
Example
A good tagline can help a brand **break the clutter**.
一个好的标语可以帮助品牌在混乱中脱颖而出。
idiom

breathe easy

在压力大或危险的情况下放松
Meaning
to relax after a stressful or dangerous situation
Example
After the pollution control laws were enforced, people could finally **breathe easy**.
在污染控制法案实施后，人们终于能够**松口气**。
idiom

Breaking news

新鲜且重要的信息正在立即报道
Meaning
New and important information being reported immediately
Example
We have **breaking news** about the election results.
我们有关于选举结果的**突发新闻**。
idiom

break the silence

在一段沉默之后开始说话
Meaning
to start talking after a period of silence
Example
He was the one to **break the silence** after the awkward pause.
尴尬的沉默之后，他是那个**打破沉默**的人。
idiom

brush aside

把某事视为不重要并置之不理
Meaning
to dismiss something as unimportant
Example
Management **brushed aside** the rumors during the briefing.
管理层在简报中**无视**了这些谣言。
idiom

blow off steam

表达愤怒或沮丧以使自己感觉更好
Meaning
to express anger or frustration so that you feel better
Example
He went for a run to **blow off steam** after the argument.
他在争论后去跑步以发泄情绪。
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

block out

忽略干扰或不愉快的想法
Meaning
to ignore distractions or unpleasant thoughts
Example
She tried to **block out** the noise and continue working.
她试图**阻挡**噪音并继续工作。
idiom

believe you’re good enough

接受你是有能力和值得的人
Meaning
to accept that you are capable and worthy
Example
To overcome fear, you must **believe you’re good enough**.
要克服恐惧，你必须相信自己足够好。
idiom

burn bridges

彻底断绝关系或联系
Meaning
to destroy relationships or connections permanently
Example
Be careful not to **burn bridges** when leaving your job.
离职时要小心，不要**断绝关系**。
idiom

bloom where you are planted

充分利用你所处的环境
Meaning
to make the best of the situation you are in
Example
Even in a small town, she managed to **bloom where she was planted**.
即使在一个小镇，她也设法在她所在的地方茁壮成长。
idiom

beyond reasonable doubt

没有任何逻辑上的不确定性
Meaning
without any logical uncertainty
Example
The jury found him guilty **beyond reasonable doubt**.
陪审团认定他毫无合理怀疑地有罪。
idiom

blind faith

不加质疑地信任
Meaning
trusting without questioning
Example
Having **blind faith** can sometimes lead to disappointment.
拥有**盲目信任**有时会导致失望。
idiom

beyond a reasonable doubt

毫无合理怀疑；完全确定
Meaning
without any logical reason to doubt; with full certainty
Example
The evidence proved his guilt **beyond a reasonable doubt**.
证据证明了他的罪行毫无合理怀疑。
idiom

beat the clock

在截止日期前完成某事
Meaning
to finish something before the deadline
Example
We managed to **beat the clock** and submit the report early.
我们成功地**赶在最后期限前**提交了报告。
idiom

burned out

因过度工作而完全疲惫
Meaning
completely exhausted or tired due to overwork
Example
After months of overtime, she felt **burned out**.
经过几个月的加班后，她感到筋疲力尽。
idiom

break the chains

摆脱限制或约束
Meaning
to free oneself from restrictions or limitations
Example
She wanted to **break the chains** of social expectations.
她想**打破社会期望的束缚**。
idiom

black box thinking

黑箱思维：通过研究输入和输出分析未知的过程
Meaning
analyzing unknown processes by studying their inputs and outputs
Example
In AI research, **black box thinking** helps improve transparency.
在AI研究中，**黑箱思维**有助于提高透明度。
idiom

build trust

在关系中建立或发展信任
Meaning
to create or develop trust in a relationship
Example
It takes time to **build trust** with new people.
与新的人建立信任需要时间。
idiom

big picture

整体观点或情况
Meaning
the overall perspective or situation
Example
Producers always try to see the **big picture** before making changes.
制片人总是在做出改变之前试图看到整体情况。
idiom

bootstrap a startup

在没有外部资金的情况下利用有限资源建立业务
Meaning
to build a business using limited resources without external funding
Example
Many successful founders **bootstrapped their startups** in the early days.
许多成功的创始人在早期就**自筹资金启动了他们的初创公司**。
idiom

back off

离开或停止给某人压力
Meaning
to move away or stop pressuring someone
Example
Let’s **back off** and give them space to decide.
让我们**退一步**，给他们一些决定的空间。
idiom

bail someone out

帮助某人摆脱困境
Meaning
to help someone out of a difficult situation
Example
His friend **bailed him out** when he ran out of money.
他的朋友在他没钱时**救了他**。
idiom

bend over backwards

付出巨大努力帮助或取悦某人
Meaning
to make a great effort to help or please someone
Example
She **bent over backwards** to make the event successful.
她竭尽全力使活动成功。
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

Born with a silver spoon in one's mouth

出生在富裕家庭。
Meaning
To be born into a wealthy family.
Example
He never had to struggle; he was **born with a silver spoon in his mouth**.
他从未需要奋斗；他出生在富裕家庭。
idiom

better safe than sorry

谨慎总比冒险后悔要明智。
Meaning
It’s wiser to be cautious than to take risks and regret later.
Example
I always double-check the locks — **better safe than sorry**.
我总是仔细检查锁 — 谨慎总比事后后悔好。
idiom

bright future ahead

拥有积极的前景或可能性
Meaning
having positive prospects or possibilities
Example
With your hard work, you have a **bright future ahead**.
通过你的努力工作，你拥有一个 **光明的未来**。
idiom

brighten up

变得更快乐或更开心
Meaning
to become happier or more cheerful
Example
Her face **brightened up** when she saw her friends.
当她看到她的朋友们时，她的脸**亮了起来**。
idiom

busy as a bee

非常活跃或勤奋
Meaning
very active or hardworking
Example
She’s **as busy as a bee** preparing for the wedding.
她正在为婚礼**像蜜蜂一样忙碌**。
idiom

break the bank

花费太多钱；把所有的钱都用光
Meaning
to cost too much; to use up all your money
Example
Buying that car will **break the bank**.
买那辆车会让你**倾家荡产**。
idiom

beyond your wildest dreams

比你想象的更好或更惊人
Meaning
better or more amazing than imagined
Example
Her success was **beyond her wildest dreams**.
她的成功超出了她最疯狂的梦想。
idiom

Blue ocean strategy

创造一个几乎没有竞争的新市场空间。
Meaning
Creating a new market space with little or no competition.
Example
Their **blue ocean strategy** helped them dominate a new market.
他们的**蓝海战略**帮助他们在新市场中占据主导地位。
idiom

break the problem down

将复杂的问题分解成较小、更易管理的部分
Meaning
to divide a complex problem into smaller, more manageable parts
Example
Let's **break the problem down** into smaller steps.
让我们把问题分解成较小的步骤
idiom

bursting with joy

充满幸福和兴奋
Meaning
full of happiness and excitement
Example
The children were **bursting with joy** on Christmas morning.
孩子们在圣诞早晨充满了喜悦。
idiom

burning the candle at both ends

没有足够的休息，拼命工作
Meaning
working very hard without enough rest
Example
He is **burning the candle at both ends** with two jobs.
他正在做两个工作，拼命工作。
idiom

bosom friend

一个非常亲密和值得信赖的朋友
Meaning
a very close and trusted friend
Example
We’ve been **bosom friends** since childhood.
我们从小就是非常要好的朋友。
idiom

battle of wills

双方都拒绝让步的冲突
Meaning
a conflict where both sides refuse to give up
Example
It became a **battle of wills** between the manager and the team leader.
它变成了经理和团队领导之间的**意志之战**。
idiom

bottom out

达到最低点然后改善
Meaning
to reach the lowest point before improving
Example
Experts believe the market has **bottomed out**.
专家认为市场已经触底。
idiom

break into a market

成功进入一个新的市场或行业
Meaning
to successfully enter a new market or industry
Example
The company is trying to **break into the Asian market**.
公司正在尝试进入亚洲市场。
idiom

back and forth

反复改变意见或决策
Meaning
to change opinions or decisions repeatedly
Example
We’ve been going **back and forth** about this issue for weeks.
我们已经就这个问题讨论了几个星期。
idiom

blow out of the water

完全惊讶或击败
Meaning
to surprise or defeat completely
Example
Their performance **blew us out of the water**.
他们的表现**完全让我们吃惊**。
idiom

black sheep

被认为是团体或家庭耻辱的人
Meaning
a person who is considered a disgrace to a group or family
Example
He is the **black sheep** of the family.
他是家里的**黑羊**。
idiom

bear the brunt

承担某件不愉快事情的主要责任或痛苦
Meaning
to take the main responsibility or suffering of something unpleasant
Example
The junior staff had to **bear the brunt** of the manager’s anger.
初级员工不得不承受经理愤怒的主要部分。
idiom

break someone’s heart

让某人非常伤心
Meaning
to make someone very sad
Example
It really **broke his heart** when she left him.
当她离开他时，真的让他心碎了。
idiom

blow a fuse

突然变得非常生气或失去控制
Meaning
to suddenly become very angry or lose control
Example
He **blew a fuse** when he saw the mess.
他看到那一团糟时勃然大怒。
idiom

bang for your buck

花费的每一分钱的价值；一个好交易
Meaning
value for the money spent; a good deal
Example
This insurance plan gives you the best **bang for your buck**.
这个保险计划给你最划算的选择。
idiom

be on the same page

与某人达成一致或有相同的理解
Meaning
to agree with someone or have the same understanding
Example
Before getting married, they made sure they were **on the same page** about their future.
在结婚之前，他们确保他们在关于未来的事情上**达成一致**。
idiom

balance of trade

一个国家的出口和进口之间的差异
Meaning
the difference between a country's exports and imports
Example
A negative **balance of trade** can weaken a nation's currency.
负的贸易平衡可能削弱一个国家的货币
idiom

Bailout package

为了防止公司或经济崩溃而提供的财务支持。
Meaning
Financial support given to prevent a company or economy from collapsing.
Example
The government announced a **bailout package** for struggling airlines.
政府为陷入困境的航空公司宣布了**bailout package**。
idiom

backroom deal

由有权势的人达成的秘密协议
Meaning
a secret agreement made by powerful people
Example
The media exposed the **backroom deal** between the two parties.
媒体揭露了两方之间的**秘密协议**。
idiom

Burn rate

创业公司花费资本的速度。
Meaning
The rate at which a startup spends its capital.
Example
Our **burn rate** is too high; we need to cut costs.
我们的**烧钱率**太高；我们需要削减成本。
idiom

bond of friendship

朋友之间信任和感情的强大联系。
Meaning
A strong connection of trust and affection between friends.
Example
Their **bond of friendship** grew stronger over the years.
他们的友谊之纽随着岁月变得更加牢固。
idiom

bear the responsibility

承担某事的责任
Meaning
to take on the duty of something
Example
She was willing to **bear the responsibility** for the new project.
她愿意为这个新项目承担责任。
idiom

beyond one’s grasp

太难理解或实现
Meaning
too difficult to understand or achieve
Example
Quantum physics is **beyond my grasp** right now.
量子物理学现在对我来说**难以理解**。
idiom

be responsible for

对某事负责
Meaning
to be in charge of or accountable for something
Example
She is **responsible for** managing the entire department.
她**负责**管理整个部门。
idiom

beat oneself up

对某事过分自责
Meaning
to blame yourself too much for something
Example
Don’t **beat yourself up** over one mistake.
不要因为一个错误而**过分责备自己**。
idiom

beginner’s luck

对新手的成功
Meaning
success for someone inexperienced
Example
He won his first game — must be **beginner’s luck**.
他赢得了第一场比赛——一定是**新手运气**。
idiom

break down in tears

突然开始哭泣
Meaning
to start crying suddenly
Example
She **broke down in tears** after hearing the sad story.
她在听到悲伤的故事后**突然哭了起来**。
idiom

blow someone's mind

让某人感到震惊或惊讶
Meaning
to amaze or astonish someone
Example
The magic show really **blew my mind**.
魔术表演真的让我大吃一惊。
idiom

be in the limelight

成为焦点
Meaning
to be the center of attention
Example
The actor was **in the limelight** after his award win.
演员在获奖后成为焦点。
idiom

bank on

依赖于或依靠某事发生
Meaning
to rely on or depend on something happening
Example
You can **bank on** her support during tough times.
你可以在困难时刻依赖她的支持。
idiom

block off

封锁一个区域，使人们无法进入
Meaning
to close an area so people cannot enter
Example
Police **blocked off** the street after the accident.
警方在事故后封锁了街道。
idiom

bottle up your feelings

隐藏或压抑你的情感
Meaning
to hide or suppress your emotions
Example
Don't **bottle up your feelings**; talk about them.
不要**压抑你的情感**；谈论它们。
idiom

balance out

反制或取消某事的效果
Meaning
to counteract or cancel the effect of something
Example
The extra volunteers should **balance out** the workload.
额外的志愿者应该平衡工作负载。
idiom

Band together

为了共同的目标而团结起来。
Meaning
To unite for a common purpose.
Example
The workers **banded together** to demand better wages.
工人们团结起来要求更高的工资。
idiom

Break the news

告诉某人重要或坏消息。
Meaning
To tell someone important or bad news.
Example
He didn’t know how to **break the news** to his parents.
他不知道如何将**这个消息传达**给他的父母。
idiom

bear market

股价下跌的时期
Meaning
a period when stock prices are falling
Example
Many people lose money during a **bear market**.
很多人在**熊市**期间亏钱。
idiom

boot up

启动计算机或系统
Meaning
to start a computer or system
Example
My laptop takes forever to **boot up**.
我的笔记本需要很长时间才能启动。
idiom

bring to life

使某事物更有趣或更逼真
Meaning
to make something more interesting or realistic
Example
The artist’s use of color really **brought the painting to life**.
艺术家使用的颜色真的 **使画作栩栩如生**。
idiom

buckle under the strain

屈服于压力或压力
Meaning
to give in to stress or pressure
Example
She refused to **buckle under the strain** and kept going.
她拒绝了**在压力下屈服**并继续前进。
idiom

be on edge

感到紧张，焦虑或容易被激怒
Meaning
to be nervous, tense, or easily upset
Example
She’s been **on edge** all day waiting for the results.
她整天都在**焦虑**地等待结果。
idiom

believe in yourself

相信自己
Meaning
to have confidence in your own abilities
Example
**Believe in yourself** and you can achieve anything.
**相信自己**，你就能实现任何事情。
idiom

beat the rap

逃避惩罚或避免被定罪
Meaning
to escape punishment or avoid being convicted
Example
He managed to **beat the rap** thanks to a clever lawyer.
他凭借一个聪明的律师成功逃避了惩罚。
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

by and large

大体上
Meaning
generally speaking; on the whole
Example
**By and large**, we agree with your proposal.
大体上，我们同意你的提案。
idiom

brand awareness

消费者对品牌的熟悉程度
Meaning
the extent to which consumers are familiar with a brand
Example
Our main goal is to increase **brand awareness** through social media.
我们的主要目标是通过社交媒体提高**品牌意识**。
idiom

Blue skies thinking

无边界的创造性或开放性思维。
Meaning
Creative or open-minded thinking without limits.
Example
Our brainstorming session encouraged **blue skies thinking**.
我们的头脑风暴会议鼓励了无边界的思维。
idiom

blow one’s own trumpet

自夸; 吹嘘自己的成就
Meaning
to praise oneself; to boast about one's achievements
Example
He loves to **blow his own trumpet** whenever he achieves something.
每当他取得某些成就时，他都喜欢**自夸**。
idiom

behind the firewall

受到保护或与外部威胁隔离
Meaning
protected or isolated from external threats
Example
Sensitive company data should always stay **behind the firewall**.
敏感的公司数据应该始终保持在**防火墙后面**。
idiom

back on one’s feet

恢复并再次变得健康
Meaning
to recover and be healthy again
Example
After a few days of rest, he’s finally **back on his feet**.
休息几天后，他终于**恢复过来**。
idiom

blood, sweat, and tears

巨大的努力和辛勤的工作
Meaning
great effort and hard work
Example
Building this company took a lot of **blood, sweat, and tears**.
建立这家公司花费了很多努力和辛勤的工作。
idiom

burning with envy

感到强烈的嫉妒
Meaning
feeling intense jealousy
Example
She was **burning with envy** when she heard about his promotion.
当她听说他的晋升时，她感到非常嫉妒。
idiom

Bet your bottom dollar

对某事非常确定或自信。
Meaning
To be very sure or confident about something.
Example
You can **bet your bottom dollar** that he’ll show up late again.
你可以**打赌你最后一块钱**他又会迟到。
idiom

backseat driver

给出不必要的建议或方向的人
Meaning
a person who gives unwanted advice or direction
Example
Don't be a **backseat driver**, let me handle it.
别当**后座司机**，让我来处理吧。
idiom

Burning question

一个重要或紧急的问题，人们急于知道。
Meaning
An important or urgent question that people are eager to know.
Example
The **burning question** is whether the plan will actually work.
最关键的问题是这个计划是否真的有效。
idiom

bend someone’s ear

与某人长时间交谈，通常是为了抱怨
Meaning
to talk to someone for a long time, usually to complain
Example
He **bent my ear** about his terrible day at work.
他**在我耳边抱怨**他工作中的糟糕一天。
idiom

blast off

以极大的能量或热情开始
Meaning
to take off or start with great energy or enthusiasm
Example
The project is ready to **blast off** next week.
该项目准备在下周启动。
idiom

break down the problem

逐步分析一个问题
Meaning
to analyze a problem step by step
Example
Let’s **break down the problem** to understand it better.
让我们逐步分析这个问题，以便更好地理解它。
idiom

boil over

当愤怒变得无法控制时
Meaning
when anger becomes too much to control
Example
The argument finally **boiled over** into a shouting match.
争论最终爆发成了一场大喊大叫的争执。
idiom

brighten up your day

使某人感到更快乐
Meaning
to make someone feel happier
Example
Her smile can **brighten up your day** instantly.
她的微笑能瞬间**让你的一天更美好**。
idiom

breach of trust

未能保持信息或承诺的安全
Meaning
a failure to keep information or promises secure
Example
Leaking user data is a major **breach of trust**.
泄露用户数据是一个严重的**信任破裂**。
idiom

bury the differences

忘记争执，重新成为朋友
Meaning
to forget disagreements and be friendly again
Example
They decided to **bury their differences** and work together.
他们决定**埋葬他们的分歧**，一起工作。
idiom

breach of security

违反或未能遵守安全协议
Meaning
a violation or failure to adhere to security protocols
Example
The company faced a significant **breach of security** last year.
公司去年面临了一个重大的安全漏洞。
idiom

Be as good as your word

Zuò nǐ suǒ chéngnuò de shì.
Meaning
To do what you promised to do.
Example
He said he’d help and he’s **as good as his word**.
Tā shuō tā huì bāngzhù, ér tā **rú tā de huà yīyàng hǎo**.
idiom

breeze through

轻松地做某事，几乎不费力气
Meaning
to do something easily and with little effort
Example
She managed to **breeze through** the exam without any problems.
她轻松地通过了考试，没有遇到任何问题。
idiom

bear in mind

记住或考虑某事
Meaning
to remember or consider something
Example
**Bear in mind** that traffic will be heavy at that time.
请记住，那时交通会很拥挤。
idiom

boil down to

归结为某个主要原因或要点
Meaning
to have something as the main point or reason
Example
The argument **boiled down to** a simple misunderstanding.
争论**归结为**一个简单的误会。
idiom

Breaking new ground

做出重要的新发现或创新；做一些前所未做过的事情。
Meaning
To make an important new discovery or innovation; to do something that has never been done before.
Example
The new trade agreement is **breaking new ground** in international relations.
新的贸易协议在国际关系中**开创了新局面**。
idiom

be lost for words

惊讶到无法言语
Meaning
to be so surprised that you cannot speak
Example
I was **lost for words** when I won the prize.
当我赢得奖品时，我 **无言以对**。
idiom

breathe in

深呼吸
Meaning
to inhale air deeply
Example
Take a moment to **breathe in** before you speak.
在说话之前，花一刻钟深呼吸。
idiom

Behind the curve

相比竞争对手，处于落后或发展较慢的状态。
Meaning
To be less advanced or slow compared to competitors.
Example
Our company is **behind the curve** in adopting AI technologies.
我们的公司在采用人工智能技术方面落后于竞争对手。
idiom

burst out laughing

突然大笑
Meaning
to suddenly start laughing loudly
Example
Everyone **burst out laughing** at his joke.
每个人听了他的笑话都**爆笑起来**。
idiom

book someone

正式指控某人犯罪
Meaning
to officially charge someone with a crime
Example
The police **booked** him for theft.
警察因盗窃指控了他。
idiom

Burst with gratitude

感到极其感激。
Meaning
To feel extremely thankful.
Example
She was **bursting with gratitude** after receiving help.
她在收到帮助后，**充满了感激之情**。
idiom

back out of

从协议或承诺中撤退
Meaning
to withdraw from an agreement or commitment
Example
He **backed out of** the trip at the last minute.
他在最后一刻**退出了**这次旅行。
idiom

blind justice

不受外部因素影响的公正正义
Meaning
justice that is impartial and not influenced by external factors
Example
**Blind justice** treats everyone the same, regardless of wealth or status.
**盲目的正义** 对每个人一视同仁，不论财富或地位。
idiom

be there for someone

在需要时支持或帮助某人
Meaning
to support or help someone when they need it
Example
True friends **are there for you** when you need them.
真正的朋友会在你需要时为你提供帮助
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

butterflies in one's stomach

感到紧张或焦虑
Meaning
feeling nervous or anxious
Example
I had **butterflies in my stomach** before the interview.
面试前我感到很紧张。
idiom

Bear with me

请耐心等我。
Meaning
Be patient with me.
Example
**Bear with me** while I fix this problem.
**请耐心等我** 当我解决这个问题时。
idiom

beta test

在正式发布之前测试产品
Meaning
to test a product before official release
Example
We are going to **beta test** our app next week.
我们将在下周进行我们的应用程序测试。
idiom

be at someone’s beck and call

随时准备帮助或服从某人
Meaning
to always be ready to help or obey someone
Example
The assistant is **at his boss’s beck and call**.
助理始终在老板的召唤下。
idiom

brute force attack

一种通过尝试所有可能的密码组合直到找到正确密码的黑客方法
Meaning
a method of hacking that tries all possible combinations of passwords until the correct one is found
Example
The attacker launched a **brute force attack** on the system’s login page.
攻击者对系统的登录页面发起了**暴力破解攻击**。
idiom

big brother

一个哥哥或一个表现得具有保护性的人
Meaning
an older brother or someone who behaves protectively
Example
Mark acts like a **big brother** to everyone in the neighborhood.
马克对邻里里的每个人都像**大哥哥**一样。