by trial and error
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idiom

by trial and error

通过实验和纠正错误来学习
Meaning
learning by experimenting and correcting mistakes
Example
We developed the best method **by trial and error**.
我们通过 **试验和错误** 开发了最好的方法。
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

by leaps and bounds

快速进展或改善
Meaning
to progress or improve very quickly
Example
Her English has improved **by leaps and bounds**.
她的英语进步**非常快**。
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

bust someone

逮捕或抓住某人做非法的事情
Meaning
to arrest or catch someone doing something illegal
Example
The officer was able to **bust someone** for selling drugs.
警察成功地逮捕了一个卖毒品的人。
idiom

burn one's bridges

摧毁无法恢复的关系或机会
Meaning
to destroy relationships or opportunities that cannot be restored
Example
He **burned his bridges** when he insulted his boss.
他在侮辱老板时**烧了自己的桥梁**
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

bad luck

不幸或运气差的情况
Meaning
unfortunate or unlucky situation
Example
It’s just **bad luck** that it rained on our picnic day.
只是**运气不好**，在我们的野餐日下雨了。
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

backpropagation

一种用于神经网络的学习算法，通过调整网络中的权重来最小化错误
Meaning
a learning algorithm used in neural networks to minimize error by adjusting weights through the network
Example
The **backpropagation** algorithm helps in optimizing the neural network's performance.
反向传播算法有助于优化神经网络的性能。
idiom

back to square one

重新开始
Meaning
to start over again
Example
After the computer crashed, I had to go **back to square one** with my report.
电脑崩溃后，我不得不重新开始我的报告。
idiom

beat down

重复用力打击，例如强烈的阳光或雨水
Meaning
to strike repeatedly with force, such as intense sun or rain
Example
The afternoon sun **beat down** on the field all day.
下午的阳光 **照射** 在田野上整整一天。
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

Bet the farm

在一个重大决定上冒险一切。
Meaning
To risk everything on one big decision.
Example
He **bet the farm** on that business deal.
他在那笔商业交易中**赌上了一切**。
idiom

build a better mousetrap

改进现有的产品或想法
Meaning
to improve an existing product or idea
Example
Every tech company tries to **build a better mousetrap** in its field.
每个科技公司都在其领域尝试**创造更好的捕鼠器**。
idiom

bring the curtain down

结束某事；完成一场表演或活动
Meaning
to end something; to finish a performance or event
Example
The concert **brought the curtain down** on the music festival.
音乐会**为音乐节画上了句号**。
idiom

break even

收入与支出相等，既无利润也无损失
Meaning
to have equal income and expenses, neither profit nor loss
Example
The company finally **broke even** after three years.
公司终于在三年后**持平**。
idiom

behind schedule

比计划或预期的时间晚
Meaning
later than planned or expected
Example
The flight is **behind schedule** because of the storm.
航班因暴风雨而**延误**。
idiom

believe you can

相信自己能做到的心态
Meaning
to have the mindset that you are capable of doing something
Example
If you **believe you can**, you’re halfway there.
如果你相信自己能做到，你就已经成功一半了。
idiom

bird’s eye view

从高处看到的视角；概览
Meaning
a view from a high position; an overview
Example
We got a **bird’s eye view** of the city from the tower.
我们从塔楼上得到了城市的**鸟瞰视角**。
idiom

behind the eight ball

处于困难的位置或处于不利地位
Meaning
to be in a difficult position or disadvantage
Example
Without proper funding, the project is **behind the eight ball**.
没有适当的资金，项目处于**困难的境地**。
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

blow someone's cover

揭露某人的秘密身份或隐藏目的
Meaning
to reveal someone's secret identity or hidden purpose
Example
The journalist accidentally **blew the cover** of the undercover agent.
记者不小心揭露了卧底特工的身份。
idiom

brick by brick

逐步而稳定地实现某事
Meaning
to achieve something gradually and steadily
Example
He built his business **brick by brick**.
他一点一点地建立了自己的事业。
idiom

button up

完成准备工作或安全地关闭某物
Meaning
to finish preparations or close something securely
Example
Let’s **button up** the proposal by Friday.
让我们在周五前**button up**提案。
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

be in the driver’s seat

控制局势
Meaning
to be in control of a situation
Example
After the merger, our company is **in the driver’s seat**.
合并后，我们公司处于**驾驶员座位**。
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

butter wouldn’t melt in their mouth

看起来无辜的人，实际上可能并非如此
Meaning
someone who looks innocent but might not be
Example
She looks so sweet—**butter wouldn’t melt in her mouth**.
她看起来那么甜美—**黄油在她嘴里不会融化**。
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

bubbling with joy

非常开心和兴奋
Meaning
very happy and excited
Example
The children were **bubbling with joy** after receiving their gifts.
孩子们在收到礼物后非常开心和兴奋。
idiom

burst with happiness

充满了极大的喜悦或兴奋
Meaning
to be full of great joy or excitement
Example
The parents **burst with happiness** when they saw their newborn baby.
当父母看到他们的新生婴儿时，他们充满了喜悦。
idiom

bottom line

最重要的点；最终结果或利润
Meaning
the most important point; the final result or profit
Example
The **bottom line** is that trade deficits are increasing.
关键是贸易逆差正在增加。
idiom

beyond the scope

超出计划或预期的重点范围
Meaning
outside the planned or expected area of focus
Example
The new feature was beyond the scope of the original project but added great value.
新功能超出了原项目的范围，但增加了很大的价值。
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

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

bite the bullet

决定做一些困难或令人不愉快的事情，之前一直拖延或犹豫不决
Meaning
to decide to do something difficult or unpleasant that one has been putting off or hesitating about
Example
I decided to **bite the bullet** and finish my homework.
我决定**咬子弹**并完成我的作业。
idiom

blackout

暂时失去意识
Meaning
to lose consciousness temporarily
Example
He suddenly **blacked out** during the match.
他在比赛中突然**晕倒**。
idiom

batten down

在准备应对问题时牢固地固定某物
Meaning
to secure something tightly in preparation for trouble
Example
Residents will **batten down** their windows before the storm.
居民们将在风暴前**bàitèn dàoūn**他们的窗户。
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

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

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

break your back

为了实现某事而非常努力地工作
Meaning
to work very hard to achieve something
Example
He’s been **breaking his back** to support his family.
他一直在**拼命工作**来养家。
idiom

buckle under pressure

因过度压力或压力而屈服或失败。
Meaning
to give in or fail due to too much stress or pressure
Example
Some employees **buckle under pressure**, while others thrive.
一些员工在压力下屈服，而其他员工则茁壮成长。
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

be in high spirits

感到非常开心和积极
Meaning
to feel very happy and positive
Example
Everyone was **in high spirits** after the successful event.
每个人在成功的活动后都非常开心。
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

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

bad blood

家庭成员之间的愤怒或怨恨
Meaning
anger or resentment between family members
Example
There’s still **bad blood** between the cousins after the inheritance issue.
继承问题后，堂兄弟姐妹之间仍然有愤怒。
idiom

be on duty

在某个时间值班或负责某事
Meaning
to be working or responsible for something at a certain time
Example
The guard was **on duty** all night.
警卫整晚都在值班。
idiom

balance the books

确保收入和支出相等
Meaning
to make sure income and expenses are equal
Example
The accountant worked late to **balance the books**.
会计加班工作，直到**平衡账本**。
idiom

burst with joy

高兴得难以抑制情感
Meaning
to be so happy that it’s hard to contain emotions
Example
The parents **burst with joy** when their child won the prize.
当孩子赢得奖项时，父母**高兴得合不拢嘴**。
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

build up your confidence

逐渐变得更加自信
Meaning
to gradually become more confident
Example
Public speaking can help you **build up your confidence**.
公众演讲可以帮助你增强信心。
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

bright spark

一个非常聪明或有才华的人
Meaning
a very clever or talented person
Example
The new intern is a real **bright spark** with great ideas.
新的实习生是一个真正的**bright spark**，拥有很棒的想法。
idiom

big mouth

一个说太多话或泄露秘密的人
Meaning
someone who talks too much or reveals secrets
Example
Don’t tell him anything — he’s got a **big mouth**.
别告诉他任何事情 — 他有一个**大嘴巴**。
idiom

botnet

一组感染了恶意软件的计算机网络，能够被黑客远程控制
Meaning
a network of computers infected with malware that are controlled remotely by a hacker
Example
The hacker used the **botnet** to launch a massive DDoS attack on the server.
黑客利用**僵尸网络**发动了大规模的DDoS攻击。
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

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

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

buy into

接受或支持一个想法或计划
Meaning
to accept or support an idea or plan
Example
The team quickly **bought into** the new workflow.
团队迅速**接受了**新的工作流程。
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

be your own biggest fan

欣赏并相信自己
Meaning
to appreciate and believe in yourself
Example
You should **be your own biggest fan** to stay motivated.
你应该成为自己最大的粉丝，以保持动力。
idiom

bring up a family

抚养和照顾孩子
Meaning
to raise and take care of children
Example
They worked hard to **bring up a family**.
他们努力工作以抚养一个家庭。
idiom

back on your feet

恢复健康了
Meaning
recovered and healthy again
Example
It’s good to see you **back on your feet** after the flu.
很高兴看到你在得流感后恢复健康。
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

bury the lead

隐藏故事中最重要的部分
Meaning
to hide the most important part of the story
Example
Don’t **bury the lead**—mention the main point first.
不要**埋没重点**—首先提到主要点。
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

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

blow someone away

让某人大为震惊或印象深刻
Meaning
to impress or surprise someone greatly
Example
Her performance really **blew me away**.
她的表演真的让我震惊。
idiom

blow away the cobwebs

在不活跃后让身心焕然一新
Meaning
to refresh one’s mind or body after inactivity
Example
A short walk helped me **blow away the cobwebs**.
一次短暂的散步帮助我**焕然一新**。
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

bookend something

标志某事的开始和结束
Meaning
to mark the beginning and end of something
Example
Her career was **bookended** by two great performances.
她的职业生涯以两场精彩的表演为开端和结束。
idiom

burn the midnight oil

工作到深夜
Meaning
to work late into the night
Example
She **burned the midnight oil** to finish her project.
她为了完成她的项目，工作到深夜。
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

butterflies in my 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

bargain chip

在谈判中用于获得更好交易的有价值的东西
Meaning
something of value used in negotiations to get a better deal
Example
His offer of a longer contract was a strong **bargain chip**.
他提出的更长期合同是一个强有力的 **bargain chip**。
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

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

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

burn one’s fingers

因为自己的错误而受苦
Meaning
to suffer because of one’s own mistake
Example
He **burned his fingers** by investing in a risky business.
他因为投资于一个冒险的生意而受到了损失。
idiom

bite the dust

失败或被打败
Meaning
to fail or be defeated
Example
Several small startups **bit the dust** last year.
去年有几家小型初创公司**失败了**。
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

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

by the skin of your teeth

勉强完成某事
Meaning
to just barely manage to do something
Example
He passed the exam **by the skin of his teeth**.
他勉强通过了考试。
idiom

brainstorm

在小组讨论中生成许多创意想法
Meaning
to generate many creative ideas in a group discussion
Example
Let’s **brainstorm** some ideas for our next campaign.
让我们为我们的下一个活动产生一些想法。
idiom

byte the bullet

勇敢地面对困难的情况
Meaning
to face a difficult situation bravely
Example
We have to **byte the bullet** and fix the system bugs now.
我们必须勇敢地面对并修复系统的漏洞。
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

blood is thicker than water

家庭关系比其他关系更强大
Meaning
family relationships are stronger than others
Example
He helped his brother because **blood is thicker than water**.
他帮助了他的兄弟，因为家庭关系比其他关系更强大。
idiom

blow one’s top

突然变得非常生气
Meaning
to suddenly become very angry
Example
He **blew his top** when he saw the mistake.
当他看到错误时，他非常生气。
idiom

bite someone’s head off

无缘无故地生气对待某人
Meaning
to speak angrily to someone without reason
Example
I just asked a question, no need to **bite my head off**!
我只是问了一个问题，没必要**对我发火**!
idiom

blue sky thinking

创造性和富有远见的思维，忽视实际限制
Meaning
creative and visionary thinking that ignores practical limitations
Example
Let's engage in some **blue sky thinking** to come up with innovative solutions.
让我们进行一些**蓝天思维**，提出创新的解决方案。
idiom

be a good sport

在困难的情况下保持公平和积极
Meaning
to be fair and positive in difficult situations
Example
Even when she lost the game, she was **a good sport** and congratulated the winner.
即使她输了比赛，她还是一个好运动员，祝贺了获胜者。
idiom

break a leg

祝愿某人在表演中好运
Meaning
to wish someone good luck in a performance
Example
Before the play started, everyone told her to **break a leg**.
在戏剧开始之前，每个人都告诉她要**祝她好运**。
idiom

behind the times

过时或未跟上现代思想
Meaning
old-fashioned or not keeping up with modern ideas
Example
My uncle still uses a typewriter—he’s **behind the times**.
我的叔叔仍然使用打字机——他 **跟不上时代**。
idiom

blow out of proportion

夸大或过度陈述某事
Meaning
to exaggerate or overstate something
Example
The media **blew the story out of proportion**.
媒体把故事夸大了。
idiom

bend the rules

做例外; 稍微修改规则
Meaning
to make exceptions; to modify rules slightly
Example
The teacher **bent the rules** to help the new student.
老师**弯曲规则**以帮助新学生。
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

buy a lemon

买到有缺陷或无价值的东西
Meaning
to buy something that is defective or worthless
Example
He **bought a lemon** when he got that used car.
当他买到那辆二手车时，他**买了一个柠檬**。
idiom

behind someone’s back

在他们不知道的情况下做某事
Meaning
to do something secretly without their knowledge
Example
She was talking about me **behind my back**.
她在**我背后**说我的坏话。
idiom

beat around the bush

避免谈论主要话题
Meaning
to avoid talking about the main topic
Example
Stop **beating around the bush** and tell me what happened.
不要绕圈子，告诉我发生了什么。
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

brush off

将某事或某人视为不重要而置之不理
Meaning
to dismiss something or someone as unimportant
Example
He tried to **brush off** the criticism during the meeting.
他试图在会议中**brush off**批评。
idiom

bury the hatchet

停止争斗并重新成为朋友
Meaning
to stop fighting and become friends again
Example
After years of argument, they decided to **bury the hatchet**.
经过多年的争执，他们决定**和解**。
idiom

bounce back from

在挫折后迅速恢复
Meaning
to recover quickly after a setback
Example
The team needs to **bounce back from** last week's loss.
队伍需要从上周的失利中迅速恢复。
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

bridge the gap

减少差异或改善关系
Meaning
to reduce differences or improve relations
Example
The treaty aims to **bridge the gap** between the two sides.
该条约旨在弥合双方之间的差距。
idiom

bide your time

耐心等待合适的时机
Meaning
to wait patiently for the right moment
Example
She decided to **bide her time** before making a move.
她决定在行动之前**耐心等待合适的时机**。
idiom

bounce back

在挫折或失败后迅速恢复
Meaning
to recover quickly after a setback or failure
Example
She **bounced back** after losing the competition.
她在输掉比赛后迅速恢复了过来。
idiom

bring home the bacon

赚取钱财养家
Meaning
to earn money to support the family
Example
He works hard every day to **bring home the bacon**.
他每天努力工作，以便赚取钱财养家。
idiom

Burn the bridges

摧毁返回先前情况的可能性
Meaning
to destroy the possibility of returning to a previous situation
Example
Once he left the company, he decided to **burn the bridges** and not look back.
一旦他离开了公司，他决定 **burn the bridges** 并且不回头看。
idiom

bring down

让某人感到难过或减少某物
Meaning
to make someone feel sad or to reduce something
Example
Don’t let one rude comment **bring down** your confidence.
不要让一个粗鲁的评论 **降低** 你的自信。
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

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

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

bull market

股票价格上涨的时期
Meaning
a period when prices of stocks are rising
Example
Investors are optimistic during a **bull market**.
投资者在**牛市**期间持乐观态度。
idiom

build one's confidence

增加自信或相信自己的能力
Meaning
to increase one's self-assurance or belief in one's abilities
Example
Public speaking classes helped him **build his confidence**.
公共演讲课程帮助他**建立了自信**。
idiom

bootstrapping

在没有外部资金的情况下建立业务
Meaning
building a business without external funding
Example
He started his company through **bootstrapping**, using only his savings.
他通过**bootstrapping**创办了自己的公司，只使用了自己的储蓄。
idiom

backdoor

一种未记录的访问系统或软件的方式，通常由黑客用来绕过安全防护。
Meaning
An undocumented way of accessing a system or software, usually used by hackers to bypass security.
Example
The attacker installed a **backdoor** to access the system at any time without being detected.
攻击者安装了一个**后门**，以便在任何时候都能访问系统，而不被发现。