C1 noun /ˈfaɪərɑːm/

firearm

火器

Meaning

a weapon capable of firing a projectile using gunpowder or other propellant

Example

The police found a hidden firearm during the investigation.

警方在调查过程中发现了一支隐藏的火器。

C1 adjective /ˈfrɛn.zid/

frenzied

狂乱

Meaning

Wildly excited or uncontrolled

Example

The frenzied crowd cheered as the band took the stage.

疯狂的人群为乐队登台而欢呼。

C1 noun /ˈfɔɪeɪr/

foyer

前厅

Meaning

An entrance hall or lobby in a building.

Example

The guests waited in the hotel foyer before checking in.

客人在酒店大厅等候办理入住手续。

C1 noun ˈfæl.ə.si

fallacy

谬误, 错误的信念, 错误推理

Meaning

False belief, misconception, false reasoning.

Example

The idea that success comes easy is a fallacy.

成功容易到来的这个想法是一个谬误。

C1 adjective + noun ˈfeɪvərəbəl klaɪˈmætɪk kənˈdɪʃənz

favorable climatic conditions

有利的气候条件

Meaning

Weather conditions that are suitable and beneficial for growth or development

Example

Winter offers favorable climatic conditions for farming.

冬天为农业提供有利的气候条件。

C1 noun /ˈfrek.əl/

Freckle

雀斑

Meaning

a small brownish spot on the skin, often becoming more pronounced through exposure to the sun

Example

Her face was covered with cute freckles that appeared every summer.

她的脸上覆盖着可爱的雀斑，每年夏天都会出现。

C1 adjective /ˈflaʊəri/

flowery

花哨的 / 装饰的

Meaning

Full of flowers or overly elaborate in style or language.

Example

She wrote a flowery letter filled with poetic phrases.

她写了一封充满诗意的花哨信。

C1 noun /foʊ/

foe

敌人

Meaning

an enemy or opponent

Example

The knight fought bravely against his foe.

骑士勇敢地与他的敌人作战。

C1 adjective /ˈflæʃi/

flashy

华丽的，炫耀的

Meaning

ostentatious or showy in a way that attracts attention

Example

He drove a flashy sports car through the city streets.

他开着一辆华丽的跑车穿过城市街道。

C1 noun /ˈfoʊk.lɔːr/

folk-lore

民间传说

Meaning

The traditional beliefs, customs, stories, songs, and practices of a community, passed down through generations.

Example

Bangladeshi folk-lore is rich with myths and legends.

中国的民间传说充满了神话和传说。

C1 adjective /ˈfaɪə.ri/

Fiery

火热的; 激情的; 暴躁的

Meaning

burning; passionate; hot-tempered; showing strong emotion

Example

She has a fiery temper that flares up quickly.

她有一个火热的脾气，容易迅速发火。

C1 noun /ˈfɛləni/

felony

重罪

Meaning

a serious crime, usually punishable by imprisonment for more than one year

Example

He was convicted of a felony and sentenced to ten years in prison.

他因重罪被定罪并被判处十年监禁。

C1 adjective, adverb (informal, vulgar) /ˈfʌkɪŋ/

fucking

他妈的 (粗俗词语用于强调)

Meaning

used for emphasis, often expressing anger or frustration (vulgar slang)

Example

It was a fucking disaster!

这真是个他妈的灾难！

C1 noun /ˈfɔːr.teɪ/ or /fɔːrt/

forte

强项

Meaning

a strong ability or talent; something one does particularly well

Example

Cooking is definitely her forte.

做饭绝对是她的强项。

C1 verb /flɪntʃ/

flinch

退缩

Meaning

to suddenly move back or away due to fear or pain

Example

He didn’t flinch when the doctor gave him the injection.

他在医生给他打针时没有退缩。

C1 adjective /frɔːt/

fraught

充满

Meaning

Filled with or likely to result in something undesirable.

Example

The negotiations were fraught with tension and uncertainty.

谈判充满了紧张和不确定性。

C1 adjective /fərˈlɔːrn/

forlorn

孤独的, 绝望的

Meaning

extremely sad, lonely, or abandoned

Example

The abandoned puppy looked so forlorn in the rain.

被遗弃的小狗在雨中看起来如此悲伤。

C1 noun /fɪkˈseɪ.ʃən/

fixation

固执的兴趣或对某事或某人的执念

Meaning

An obsessive interest in or feeling about someone or something.

Example

His fixation on perfectionism delayed project completion.

他对完美主义的固执导致项目完成的延迟。

C1 noun /fɪˈdɛl.ɪ.ti/

fidelity

忠诚

Meaning

Faithfulness to a person, cause, or belief, demonstrated by continuing loyalty and support.

Example

A dog's fidelity to its owner is unmatched.

狗对主人忠诚无比。

C1 noun fluˈɪd.ɪ.ti

fluidity

流动性

Meaning

The ability of a substance to flow easily; smooth and graceful movement or style.

Example

The fluidity of the dancer's movements was mesmerizing.

舞者动作的流动性令人着迷。

C1 verb /ˈfɔːltər/

falter

犹豫或失去力量或动力

Meaning

to hesitate or lose strength or momentum

Example

Her voice faltered as she delivered the speech.

她的声音在演讲时颤抖。

C1 verb /feɪn/

feign

假装, 装作

Meaning

to pretend or fake; to give a false appearance of

Example

She feigned illness to avoid going to work.

她假装生病以避免去工作。

C1 noun /ˈfɔːrdʒər/

forger

伪造者

Meaning

a person who makes fake documents, artworks, or signatures

Example

The police arrested a forger who had been selling counterfeit paintings.

警方逮捕了一名伪造者，他一直在出售伪造的画作。

C1 noun /fiːnd/

fiend

恶魔，邪恶的人

Meaning

an evil spirit or demon; a wicked or cruel person; someone obsessed with a particular thing

Example

He is a real fiend when it comes to solving puzzles.

当涉及解谜时，他真的是个恶魔。

C1 verb /ˈfɜːrmɛnt/

ferment

经历一个化学过程，其中糖分转化为酒精或酸; 激起或引发变化

Meaning

to undergo a chemical process where sugars are converted to alcohol or acid; to incite or stir up change

Example

The grapes are left to ferment for several weeks.

葡萄被留下来发酵几个星期。

C1 verb /fɔːrˈɡoʊ/

forego

放弃

Meaning

to decide not to do or have something pleasant or valuable

Example

She decided to forego dessert to maintain her diet.

她决定放弃甜点，以保持她的饮食。

C1 noun, verb /ˈfɛrɪt/

ferret

雪貂, 坚持不懈地寻找或发现某物

Meaning

a small domesticated animal used for hunting; to search or uncover something persistently

Example

He ferreted out the hidden documents.

他发现了隐藏的文件。

C1 noun /ˈflɔː.rə/

flora

在特定地区或栖息地中发现的植物生命

Meaning

The plant life found in a particular region or habitat.

Example

The Amazon rainforest is home to a vast flora diversity.

亚马逊雨林是丰富的植物群多样性的家园。

C1 adjective ˈflʌd proʊn

flood-prone

易受洪水影响

Meaning

Susceptible to flooding; likely to experience floods frequently.

Example

Bangladesh is a flood-prone deltaic nation.

孟加拉国是一个容易发生洪水的三角洲国家。

C1 noun /ˈfɔːrˌbɛərz/

forebears

祖先

Meaning

Ancestors or people in previous generations from whom one is descended.

Example

We must honor the traditions of our forebears.

我们必须尊重我们祖先的传统。

C1 adjective /ˈfæn.sɪ.fəl/

fanciful

幻想的, 不现实的

Meaning

overimaginative, unrealistic, or whimsical

Example

The story was too fanciful to be true.

这个故事太幻想了，不可能是真的。

C1 adjective /ˈfrɪdʒɪd/

Frigid

寒冷的; 冰冻的

Meaning

extremely cold; freezing; icy

Example

The frigid weather made it difficult to go outside.

寒冷的天气让出去变得困难。

C1 adjective /ˌfɑːrˈfetʃt/

farfetched

不太可能或不太真实

Meaning

unlikely to happen or be true; improbable

Example

His explanation for being late sounded farfetched.

他解释迟到的理由听起来不可信。

C1 noun, verb /ˈfɜːrloʊ/

furlough

临时休假

Meaning

temporary leave of absence from work, especially that granted to an employee or soldier

Example

Many workers were placed on furlough during the crisis.

许多工人在危机期间被放置在休假状态。

C1 noun /ˈfɔːrsəm/

foursome

四人组

Meaning

a group of four people or things, especially in games or social activities

Example

The foursome enjoyed a game of golf together.

四人组一起享受了一场高尔夫比赛。

C1 verb /fɔːˈbɛər/

forbear

克制

Meaning

To refrain from doing something; to show patience or self-control.

Example

She forbore from commenting on his mistake.

她克制了对他错误的评论。

C1 adjective /ˌfʊl ˈbɒd.id/

full-bodied

口感浓烈

Meaning

Having a strong, rich, and robust quality, especially of wine, coffee, or voice.

Example

He prefers a full-bodied red wine with his dinner.

他喜欢与晚餐搭配的口感浓烈的红酒。

C1 noun ˈfɜːr.vɚ

fervor

热情或热衷

Meaning

Strong passion or enthusiasm for something.

Example

He spoke with great fervor about his vision for the company.

他以极大的热情谈论他对公司未来的愿景。

C1 verb ˈflʌk.tʃu.eɪt

fluctuate

波动

Meaning

To regularly increase or decrease.

Example

Stock prices fluctuate due to market conditions.

股价因市场条件而波动。

C1 noun ˈflɔː.rə ænd ˈfɔː.nə

flora and fauna

植物和动物

Meaning

The plants and animals of a particular region, habitat, or geological period.

Example

The Galápagos Islands have unique flora and fauna.

加拉帕戈斯群岛拥有独特的植物和动物。

C1 noun /fɪˈnænʃɪər/

financier

金融家

Meaning

a person who manages large amounts of money or investments

Example

The financier advised the company on its investments.

金融家为公司提供了关于投资的建议。

C1 adjective /fɪkˈtɪʃəs/

fictitious

虚构的, 假的

Meaning

not real or true; imaginary or fabricated

Example

The story he told was entirely fictitious.

他讲的故事完全是虚构的。

C1 verb /ˈfʌmbəl/

fumble

搞乱

Meaning

to handle something clumsily or to make mistakes while doing something

Example

He fumbled with the keys and dropped them on the floor.

他搞乱了钥匙，把它们掉在地板上。

C1 noun /ˈflæt.ər.i/

Flattery

恭维

Meaning

excessive and insincere praise, given especially to further one's own interests

Example

His constant flattery made everyone suspicious of his true motives.

他不断的恭维使大家怀疑他的真实动机。

C1 noun ˌfɔːtɪfɪˈkeɪʃn

fortification

防御工事

Meaning

A defensive wall or other reinforcement built to strengthen a place against attack.

Example

The fortifications protected the city.

防御工事保护了城市。

C1 noun /ˈfæs.ɪt/

facet

方面, 特点, 部分

Meaning

One of the many aspects or features of something; a particular part or element of something.

Example

Every facet of the project was carefully analyzed.

项目的每个方面都进行了仔细分析。

C1 adjective /ˈfeɪt.fəl/

fateful

决定性或灾难性的

Meaning

having significant or disastrous consequences

Example

Their fateful decision changed the course of history.

他们的决定性决定改变了历史的进程。

C1 verb /flɔːnt/

flaunt

炫耀

Meaning

to show off something proudly, often to attract attention

Example

She likes to flaunt her new jewelry at parties.

她喜欢在派对上炫耀她的新珠宝。

C1 noun /fəˈnætɪsɪzəm/

fanaticism

狂热

Meaning

the quality of being fanatical; extreme zeal or obsession

Example

Religious fanaticism can lead to intolerance and conflict.

宗教狂热可能导致不宽容和冲突。

C1 noun /ˌfɪɡjʊˈriːn/

figurine

小型装饰雕像

Meaning

a small ornamental statue or model of a human or animal

Example

She bought a porcelain figurine of a dancing ballerina.

她买了一尊舞蹈芭蕾舞者的瓷雕像。

C1 noun ˈfɔː.saɪt

foresight

远见

Meaning

The ability to predict or the action of predicting what will happen or be needed in the future.

Example

His foresight helped the company avoid financial losses.

他的远见帮助公司避免了经济损失。

C1 noun /ˈfen.jʊ.griːk/

Fenugreek

胡芦巴

Meaning

an herb whose seeds and leaves are used as a spice in cooking

Example

Fenugreek seeds have a slightly bitter taste and are commonly used in Indian cuisine.

胡芦巴种子有轻微的苦味，通常用于印度菜肴中。

C1 noun, verb /ˈfrænʧaɪz/

franchise

特许经营

Meaning

A legal right to sell or distribute goods or services in a specific area; to grant such a right.

Example

He opened a new fast-food franchise in the city.

他在城市里开设了一家新的快餐特许经营店。

C1 noun /ˈfɔːrmən/

foreman

负责一组工人的人，特别是在工厂或建筑工地上

Meaning

a person in charge of a group of workers, especially in a factory or construction site

Example

The foreman supervised the workers on the construction site.

工头在建筑工地上监督工人。

C1 verb/noun ˈfæð.əm

fathom

理解

Meaning

To understand after much thought; to measure the depth of water; to comprehend.

Example

It is difficult to fathom the depths of the ocean.

很难理解海洋的深度。

C1 noun /fəˈsɑːd/

facade

外立面

Meaning

The front of a building; a false or superficial appearance

Example

The building's glass facade reflected the sunset.

建筑物的玻璃外立面反射了日落。

C1 noun /fɪˈnɛs/

finesse

精妙, 技巧, 高雅

Meaning

Subtlety and skill; refinement and delicacy in performance or artistry.

Example

The artist painted with great finesse.

艺术家以极高的精妙感画画。

C1 verb /ˈfrɒlɪk/

frolic

欢快地玩耍

Meaning

to play and move about cheerfully, energetically, or playfully

Example

The children frolicked in the garden all afternoon.

孩子们整个下午在花园里欢快地玩耍。

C1 noun/verb ˈfɒr.ɪdʒ

forage

饲料，寻找食物

Meaning

Food for horses and cattle, especially dried hay or feed; to search for food.

Example

Animals forage for food during the winter months.

动物们在冬季寻找食物。

C1 adjective /freɪl/

frail

脆弱

Meaning

Physically weak and delicate.

Example

The old man was too frail to walk without help.

这位老年人太虚弱，无法在没有帮助的情况下走路。

C1 adjective ˈfjuː.taɪl

futile

徒劳的

Meaning

Incapable of producing any useful result; pointless.

Example

His attempts to change the situation were futile.

他改变局势的努力是徒劳的。

C1 noun /ˈfɔːr.tɪ.tjuːd/

fortitude

坚韧

Meaning

Courage in pain or adversity; mental and emotional strength in facing difficulty.

Example

She faced adversity with great fortitude.

她以巨大的勇气面对困境。

C1 noun ˌfɜːr.tɪ.laɪˈzeɪ.ʃən

fertilization

施肥

Meaning

The process of adding nutrients to soil to increase crop productivity.

Example

Organic fertilization enhances soil health.

有机施肥有助于改善土壤健康。

C1 noun/adjective /fɔːrˈboʊdɪŋ/

foreboding

不祥的预感

Meaning

A feeling that something bad will happen; ominous.

Example

She felt a deep sense of foreboding as she entered the abandoned house.

她走进那座废弃的房子时，感到一种深深的不祥预感。

C1 noun /fruːˈɡæl.ə.ti/

frugality

节俭

Meaning

The quality of being economical in use or expenditure; not wasteful.

Example

Frugality is essential for saving money effectively.

节俭对有效节省钱至关重要。

C1 noun /flæt fɪʃ/

Flat fish

比目鱼

Meaning

a type of fish with a flattened body that lives on the sea floor

Example

Flat fish like sole and flounder are excellent for grilling.

像鳎鱼和比目鱼这样的平鱼非常适合烤制。

C1 noun /fɪlθ/

filth

肮脏

Meaning

dirty or disgusting matter; moral corruption

Example

The streets were full of filth after the storm.

暴风雨后街道上满是肮脏。

C1 adjective /ˈfɔːrmətɪv/

formative

形成性的

Meaning

Having a lasting influence on a person's development or character.

Example

Childhood is often described as a formative stage in life.

童年常被描述为人生中的一个形成性阶段。

C1 adjective /flæmˈbɔɪənt/

flamboyant

华丽的、色彩斑斓的或自信的

Meaning

showy, strikingly bold or colorful; confident and lively

Example

His flamboyant style drew everyone's attention at the party.

他那华丽的风格吸引了派对上所有人的注意。

C1 noun /fəˌsɪlɪˈteɪʃən/

facilitation

便利化

Meaning

The action of facilitating or making an action or process easier or helping bring about an outcome.

Example

Her facilitation made the meeting run smoothly.

她的便利使会议顺利进行。

C1 adjective /ˈflæɡɪŋ/

flagging

变得疲惫、虚弱或失去热情

Meaning

becoming tired, weaker, or less enthusiastic

Example

After hours of work, his energy was flagging.

经过数小时的工作，他的精力正在减退。

C1 adjective /ˈfeɪl.seɪf/

fail-safe

故障保护

Meaning

designed to prevent failure or accidents; guaranteed to work correctly

Example

The engineers installed a fail-safe mechanism in the nuclear plant.

工程师在核电厂安装了故障保护机制。

C1 noun /ˈfænsiər/

fancier

爱好者

Meaning

a person who has a special interest in a particular thing or activity, especially animals or hobbies

Example

He is a fancier of rare birds.

他是稀有鸟类的爱好者。

C1 verb /ˈflɪk.ər/

flicker

闪烁

Meaning

to shine unsteadily or waver between light and dark

Example

The candle flickered in the wind.

蜡烛在风中闪烁。

C1 adjective/noun /fəˈrɛns.ɪk/

forensic

应用于刑事或法律事务的科学分析

Meaning

Scientific analysis applied to criminal or legal matters

Example

Forensic experts analyze cybercrimes using advanced tools.

法医专家使用先进的工具分析网络犯罪。

C1 noun /fruˈɪʃən/

fruition

实现

Meaning

The realization or fulfillment of a plan, project, or desire.

Example

Her dream of becoming a doctor finally came to fruition.

她成为医生的梦想终于实现了。

C1 adjective /ˈfɪs.kəl/

fiscal

财政的

Meaning

Relating to government revenue, especially taxes, or public money management.

Example

The government introduced new fiscal policies to control inflation.

政府推出了新的财政政策来控制通货膨胀。

C1 adjective fæsˈtɪd.i.əs

fastidious

挑剔的，讲究细节的

Meaning

Very attentive to and concerned about accuracy and detail.

Example

She is fastidious about maintaining cleanliness.

她在保持清洁方面非常讲究。

C1 verb /fɔrˈstɔl/

forestall

提前预防

Meaning

to prevent by acting in advance; to anticipate and counter

Example

They forestalled the crisis by taking immediate action.

他们通过立即行动避免了危机。

C1 verb, noun /ˈflʌstər/

fluster

使困惑

Meaning

to make someone agitated or confused

Example

The unexpected question flustered him.

这个意外的问题让他感到困惑。

C1 noun /ˌfæb.rɪˈkeɪ.ʃən/

fabrication

虚假发明

Meaning

The invention of false or misleading information; a lie or falsehood.

Example

The article was full of fabrication and misleading claims.

这篇文章充满了虚假的发明和误导性的声明。

C1 adjective ˈfɔːr.mɪ.də.bəl

formidable

强大的

Meaning

Inspiring fear or respect through being impressively large, powerful, intense, or capable.

Example

The boxer was a formidable opponent in the ring.

那名拳击手是拳台上一个强大的对手。

C1 noun /ˈfɛlən/

felon

罪犯

Meaning

a person who has committed a serious crime

Example

The felon was sentenced to ten years in prison.

罪犯被判处十年监禁。

Meaning

to lose or give up something, usually as a penalty for wrongdoing

Example

He had to forfeit the match after breaking the rules.

C1 noun fɔːlt ˈtɒl.ər.əns

fault-tolerance

容错性

Meaning

The ability of a system to continue operating properly in the event of the failure of some of its components.

Example

Fault-tolerance ensures dependable systems.

容错性确保了可靠的系统。

C1 noun/adjective ˈflɛdʒ.lɪŋ

fledgling

初学者, 没有经验, 新成立的

Meaning

New, inexperienced, newly established.

Example

The fledgling startup needs investment.

这个新成立的公司需要投资。

C1 verb /ˈflaʊndər/

flounder

挣扎

Meaning

To struggle or stagger clumsily; to experience difficulty or confusion.

Example

He floundered in the interview when asked difficult questions.

当被问到困难的问题时，他在面试中挣扎。

C1 noun /ˈfjuː.də.lɪ.zəm/

feudalism

封建主义

Meaning

the social system in medieval Europe in which people worked and fought for nobles who gave them protection and land in return

Example

Feudalism shaped the political structure of medieval Europe.

封建主义塑造了中世纪欧洲的政治结构。

C1 adjective /ˈfɔːrsəbl/

forcible

强行

Meaning

Done by force; using physical strength or power.

Example

The police made a forcible entry into the house.

警方强行进入了房屋。

C1 adjective /ˈfjuː.dəl/

feudal

封建的

Meaning

relating to the system of feudalism, a medieval social system based on land ownership and obligations

Example

The castle is a remnant of the feudal era.

城堡是封建时代的遗迹。

C1 noun/verb /freɪ/

fray

争斗, 磨损

Meaning

As a noun, a fight or heated dispute; as a verb, to unravel or wear out through friction.

Example

He tried to stay calm, but his nerves began to fray during the argument.

他试图保持冷静，但在争论中他的神经开始磨损。

C1 noun /frɪndʒ/

fringe

装饰边缘 / 边界

Meaning

A decorative border of threads; the outer edge or margin of something.

Example

The festival had a fringe of small independent performances.

节日有一条小型独立表演的边缘。

C1 noun /ˈfɔːrdʒəri/

forgery

伪造

Meaning

the crime of making fake documents, money, or artworks

Example

The bank detected a forgery in the signature on the cheque.

银行发现支票签名上的伪造。

C1 noun /ˈfɔː.nə/

fauna

特定地区的动物生命

Meaning

The animal life of a particular region, habitat, or geological period.

Example

The fauna of the African savannah includes lions and elephants.

非洲草原的动植物群包括狮子和大象。

C1 verb /ˈfæbrɪkeɪt/

fabricate

编造

Meaning

to invent or concoct something, often with the intent to deceive; or to construct or manufacture

Example

The witness fabricated his testimony to protect himself.

证人为了保护自己而编造了他的证词。

C1 noun /ˈfʊtˌnoʊt/

foot-note

脚注

Meaning

A note of reference, explanation, or comment placed at the bottom of a page.

Example

The author included a foot-note to explain the historical context.

作者加入了一个脚注，以解释历史背景。

C1 noun /ˈfɔːrˌbɛər/

forebear

祖先

Meaning

An ancestor, especially one who lived a long time ago.

Example

He often speaks of his forebears with great respect.

他常常带着极大的敬意谈论他的祖先。

C1 noun ˌfræɡ.mənˈteɪ.ʃən

fragmentation

碎片化

Meaning

The process or state of breaking or being broken into fragments.

Example

Habitat fragmentation threatens many species.

栖息地的碎片化威胁着许多物种。

C1 noun /fɔːrˈkloʊʒər/

foreclosure

止赎

Meaning

The legal process by which a lender takes control of a property from a borrower who has failed to make payments.

Example

The family lost their home due to foreclosure after missing several mortgage payments.

这家人由于未支付多次按揭贷款而在止赎过程中失去了他们的家。

C1 adjective /ˈfɜːr.vənt/

fervent

热情的，激情四射的

Meaning

having or showing intense passion or enthusiasm

Example

She gave a fervent speech about climate change.

她发表了关于气候变化的热情演讲。

C1 noun /fiːt/

feat

壮举

Meaning

an achievement that requires great courage, skill, or strength

Example

Climbing Mount Everest was a remarkable feat.

攀登珠穆朗玛峰是一项非凡的壮举。

C1 noun (plural of fungus) /ˈfʌndʒaɪ/

fungi

真菌

Meaning

a group of spore-producing organisms such as mushrooms, molds, and yeasts

Example

Fungi play an important role in breaking down organic matter in nature.

真菌在自然界中在分解有机物质方面发挥着重要作用。

C1 adverb /ˈfɪksɪdli/

Fixedly

专心地

Meaning

in a steady, unmoving manner; with intense concentration

Example

He stared fixedly at the painting.

他专心地盯着画作。

C1 verb /flɑp/

flop

失败

Meaning

to fall or move heavily and clumsily; to fail completely

Example

The new movie flopped at the box office.

新电影在票房上失败了。

C1 noun /ˈfiːtəs/

fetus

胎儿

Meaning

an unborn or unhatched offspring in the womb or egg

Example

The doctor explained the development of the fetus during pregnancy.

医生解释了胎儿在怀孕期间的发展。

联合

Meaning

to unite in a league or federation; to form an alliance

Example

Several states federated to create a stronger union.

几个州联合起来创造了一个更强大的联盟。