forefather
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C1 noun /ˈfɔːrˌfɑːðər/

forefather

祖先
Meaning
an ancestor, especially one who was part of an earlier generation of a family or nation
Example
Our forefathers fought for independence.
我们的祖先为独立而战斗。
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 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 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 /ˈfɔːrˌrʌnər/

forerunner

先驱
Meaning
A person or thing that comes before another; a predecessor or harbinger.
Example
The Wright brothers were the forerunners of modern aviation.
莱特兄弟是现代航空的先驱。
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 /ˈfaɪ.naɪt/

Finite

有限的; 有边界的
Meaning
limited; having bounds or limits; not infinite
Example
Earth has finite natural resources.
地球有有限的自然资源。
C1 adjective /ˈfɑːð.ər.ləs/

fatherless

没有父亲
Meaning
without a father
Example
The fatherless child relied on the support of his community.
这个没有父亲的孩子依赖于他社区的支持。
C1 noun /fiˈæs.koʊ/

fiasco

彻底失败
Meaning
a complete failure, especially a ludicrous or humiliating one
Example
The event turned into a complete fiasco due to poor planning.
由于糟糕的规划，活动变成了彻底的失败。
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 /ˈfreɪlti/

frailty

脆弱
Meaning
The condition of being weak, delicate, or easily broken.
Example
Old age often comes with physical frailty.
衰老通常伴随着身体的脆弱。
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 noun /ˈfʌŋɡəs/

fungus

真菌
Meaning
a spore-producing organism feeding on organic matter, including molds, yeast, and mushrooms
Example
A strange fungus was growing on the old tree.
一种奇怪的真菌在老树上生长。
C1 noun flɛər

flair

天赋
Meaning
A natural ability to do something well.
Example
She has a flair for design, always creating visually stunning work.
她有设计的天赋，总是创造出视觉上令人印象深刻的作品。
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 noun /ˈfɔːrɡraʊnd/

foreground

前景
Meaning
the part of a scene that is nearest to and in front of the viewer
Example
The flowers in the foreground brightened the picture.
前景的花朵使画面更加生动。
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 /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 noun /faɪˈnælɪti/

finality

最终性
Meaning
the quality of being final or irreversible; a sense of conclusiveness
Example
The judge's decision gave the case a sense of finality.
法官的决定赋予案件一种最终性的感觉。
C1 verb /ˈfɛdərət/

federate

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。
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 adverb /ˈfeɪ.təl.i/

Fatally

致命地
Meaning
in a way that causes death; with deadly consequences; critically
Example
The accident fatally injured two passengers.
事故致命地伤害了两名乘客。
C1 noun/verb /ˈfʌrəʊ/

furrow

Meaning
A long narrow trench made in the ground by a plow; to make wrinkles or grooves.
Example
The farmer plowed furrows in the field.
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 /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 noun/verb /fliːs/

fleece

Meaning
The woolly covering of a sheep; as a verb, to swindle or cheat someone.
Example
The farmer sheared the sheep’s fleece carefully.
C1 noun /fəˈrɒs.ə.ti/

ferocity

凶猛，暴力，强度
Meaning
The state or quality of being ferocious; extreme fierceness or violence.
Example
The storm's ferocity was devastating.
风暴的猛烈程度是毁灭性的。
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 /ˈfoʊliɪdʒ/

foliage

树叶
Meaning
The leaves of a plant, collectively.
Example
The autumn foliage looked stunning in the park.
秋天的树叶在公园里看起来很惊艳。
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 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 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 verb /fɔːrˈɡoʊ/

forgo

放弃
Meaning
to decide not to do or have something
Example
She decided to forgo dessert to maintain her diet.
她决定放弃甜点以保持她的饮食。
C1 adjective /ˈfuːlpruːf/

foolproof

万无一失
Meaning
Designed to be very easy to use or understand, leaving no possibility of failure or error.
Example
The new software has a foolproof installation process.
这款新软件具有万无一失的安装过程。
C1 verb /ˈfɪdʒɪt/

fidget

坐立不安，焦虑不安
Meaning
to make small movements, especially because of nervousness or impatience
Example
The child began to fidget during the long lecture.
孩子在漫长的讲座中开始不停地动。
C1 adjective /ˈfræɡməntɪd/

fragmented

碎片化, 分割, 不完整
Meaning
Having been broken into fragments; disjointed or incomplete.
Example
The information was fragmented and difficult to understand.
信息被碎片化了，难以理解。
C1 verb /fɔːrˈkloʊz/

foreclose

止赎
Meaning
to take possession of a property due to the owner's failure to keep up mortgage payments
Example
The bank decided to foreclose on the property after months of missed payments.
银行在错过几个月付款后决定没收财产。
C1 verb /fɔːrˈtɛl/

foretell

预言
Meaning
to predict or announce something before it happens
Example
The old man claimed he could foretell the future.
那位老人声称他能够预言未来。
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 /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 /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 adjective /ˈfɛrəl/

feral

野生的
Meaning
existing in a wild or untamed state; not domesticated
Example
The feral cat roamed the streets at night.
那只野猫在晚上游荡在街头。
C1 verb /ˈfɔːrtɪˌfaɪ/

fortify

加强
Meaning
To strengthen a place, person, or thing physically or mentally.
Example
They fortified the city walls to protect against invasion.
他们加固了城市的墙壁，以防止入侵。
C1 noun /fɑːrs/

farce

闹剧
Meaning
a comic dramatic work using buffoonery and horseplay, or a ridiculous situation
Example
The meeting turned into a complete farce with everyone arguing.
会议变成了一场彻底的闹剧，大家都在争论。
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 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 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 /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 adverb /ˈfɜː.vənt.li/

Fervently

热情地; 激情地;
Meaning
with passionate intensity; ardently; with great emotion or enthusiasm
Example
She fervently hoped that her dreams would come true.
她热情地希望她的梦想能成真。
C1 adjective /frəˈtɜːrnəl/

fraternal

Meaning
Relating to brothers or brotherhood; friendly and supportive.
Example
The two nations maintain a fraternal relationship.
C1 noun /ˈfjuː.tʃə.rɪst/

futurist

未来主义者
Meaning
A person who studies or predicts the future, especially trends in science, technology, or society.
Example
The futurist predicted major changes in transportation within the next decade.
未来主义者预测了下一个十年交通运输的重大变化。
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 verb /ˈfɔːlsɪfaɪ/

falsify

伪造
Meaning
to make something false or to misrepresent
Example
He tried to falsify the documents to avoid taxes.
他试图伪造文件以避免税收。
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 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。
C1 adjective /ˈfruːt.ləs/

Fruitless

徒劳的; 无用的; 无效的;
Meaning
unsuccessful; futile; pointless;
Example
After hours of searching, their efforts proved fruitless.
经过数小时的搜索，他们的努力证明是徒劳的。
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 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 adjective /ˈflɪmzi/

flimsy

脆弱的
Meaning
weak, fragile, or lacking in strength; not convincing
Example
The chair was too flimsy to support his weight.
这把椅子太脆弱了，无法支撑他的重量。
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 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 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 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 adjective ˈfæʃ.ɪst

fascist

法西斯
Meaning
Relating to or characteristic of fascism; extremely authoritarian.
Example
Fascist governance undermines freedom.
法西斯统治破坏自由。
C1 noun /ˈfɔːls.hʊd/

Falsehood

虚伪; 谎言
Meaning
the state of being untrue; a lie
Example
The politician was caught spreading falsehoods about his opponent.
那位政治家被抓到散播关于对手的谎言。
C1 adjective /frəˈnɛtɪk/

frenetic

狂乱的
Meaning
Fast and energetic in a wild or uncontrolled way.
Example
The stock market experienced frenetic trading after the announcement.
公告后股市经历了狂乱的交易。
C1 noun /ˈfoʊ.kəs ˈtræk.ɪŋ/

focus tracking

聚焦追踪
Meaning
A technique of monitoring and maintaining attention on specific tasks or goals.
Example
Proper focus tracking improves productivity.
适当的聚焦追踪可以提高生产力。
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 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/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 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 /ˈfɪɡjərˌhɛd/

figurehead

象征性领导
Meaning
a nominal leader with no real power; a symbolic head
Example
The king was merely a figurehead with no real authority.
国王只是一个没有实权的象征性领袖。
C1 adjective /ˈfrɪvələs/

frivolous

轻浮
Meaning
Not having any serious purpose or value; silly or unimportant.
Example
She dismissed the frivolous complaint quickly.
她迅速驳回了这个轻浮的投诉。
C1 noun /ˈfɛərˌɡraʊndz/

fairgrounds

集市场地
Meaning
A designated area where fairs, exhibitions, and amusement events are held
Example
The town set up rides and stalls at the fairgrounds for the annual festival.
小镇在集市场地设置了游乐设施和摊位，为年度节日做准备。
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 /ˈfruː.ɡəl/

Frugal

节俭; 经济
Meaning
economical; thrifty;
Example
She is very frugal and saves money by buying only necessary items.
她非常节俭，通过只购买必要的物品来节省钱。
C1 adjective /ˈfiːzəbl/

feasible

可行的
Meaning
possible to do easily or conveniently; practical and workable
Example
It is feasible to complete the project within two months.
在两个月内完成这个项目是可行的。
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 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 /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 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 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 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 /fɪˈnɑːleɪ/

finale

结尾
Meaning
the last part or conclusion of a performance, event, or series
Example
The concert ended with a spectacular finale.
音乐会以一个壮观的菲纳尔结束。
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 /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 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 noun /ˈfɔːrˌθɔːt/

forethought

预见
Meaning
careful consideration of what will be necessary or may happen in the future
Example
With a little forethought, we could have avoided the problem.
稍微有一点预见性，我们本可以避免这个问题。
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 adjective /ˈfænsiːd/

fancied

想象的, 渴望的
Meaning
imagined, desired, or believed without evidence
Example
He is a fancied suitor in the eyes of the young lady.
他是年轻女士眼中的一位想象中的追求者。
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。
C1 verb /fret/

fret

担心
Meaning
to worry or be anxious; to be troubled
Example
Don't fret about the exam results.
不要为考试成绩而烦恼。
C1 noun /ˈfɔːreɪ/

foray

突袭 / 初步尝试
Meaning
A sudden short attack or attempt, especially into new activity or territory.
Example
The company made its first foray into the international market.
公司首次进军国际市场。
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, 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 /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 adjective /ˈfiːlaɪn/

feline

猫的特征
Meaning
relating to or characteristic of cats
Example
Her movements were graceful and almost feline in their elegance.
她的动作优雅，几乎像猫一样。
C1 verb /flaʊt/

flout

蔑视
Meaning
To openly disregard or show contempt for a rule or law.
Example
The company was fined for flouting environmental regulations.
该公司因违反环保规定而被罚款。
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 noun /ˈflæn.əl/

Flannel

法兰绒
Meaning
a soft woven fabric, typically made of wool or cotton and slightly milled and raised
Example
He wore a warm flannel shirt in winter.
他在冬天穿了一件温暖的法兰绒衬衫。
C1 noun /ˈfɒdər/

fodder

饲料
Meaning
food for livestock such as cattle, horses, or sheep; also something considered of little value but used to supply a demand
Example
The farmer stored enough fodder for the cattle to last through winter.
农民储存了足够的饲料，以便牲畜能度过冬天。
C1 adjective /ˈfɪɡərətɪv/

figurative

比喻的
Meaning
not literal; using figures of speech or symbolic representation
Example
She used figurative language to describe her feelings.
她用比喻的语言来描述她的感受。
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 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 /fɔːrˈmæl.ə.ti/

Formality

形式
Meaning
the rigid observance of rules of convention or etiquette; a thing done simply to comply with requirements
Example
The signing of the contract was just a formality; the deal was already agreed upon.
签署合同只是一个形式；交易已经达成。
C1 adjective /ˈflʌstərd/

flustered

困惑
Meaning
in a state of confusion or agitation
Example
She appeared flustered after being asked so many questions.
她在被问了那么多问题后，看起来有些困惑。
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 /ˈfliː.tɪŋ/

fleeting

短暂的
Meaning
Lasting for a very short time; passing quickly.
Example
Happiness can be fleeting, so cherish every moment.
幸福可能是短暂的，所以珍惜每一刻。
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 /ˈfrɔːdjʊlənt/

fraudulent

欺诈的
Meaning
Involving or using deceit, especially criminal deception.
Example
He was arrested for making fraudulent insurance claims.
他因提交欺诈性保险索赔而被捕。
C1 verb /fɔːrˈseɪk/

forsake

Meaning
to abandon or give up something or someone
Example
He decided not to forsake his old friends despite his success.
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 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 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 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 noun /ˈfeɪvərɪtɪzəm/

favoritism

偏袒
Meaning
the practice of giving unfair preferential treatment to one person or group
Example
The manager was accused of favoritism towards certain employees.
经理被指控偏袒某些员工。
C1 adjective /ˌfɑːrˈfɛtʃt/

far-fetched

牵强附会
Meaning
unlikely to happen or be true; improbable
Example
His explanation for being late was a bit far-fetched.
他解释迟到的理由有点牵强附会。
C1 verb /ˈfɜːr.tɪ.laɪz/

fertilize

施肥
Meaning
to make soil or land more fertile by adding substances
Example
Farmers fertilize the fields to increase crop yield.
农民施肥以增加作物产量。
C1 noun /ˌfɜːrmənˈteɪʃən/

fermentation

发酵，酵母或细菌的化学变化
Meaning
a chemical process by which substances like sugar are converted into alcohol or acids using microorganisms
Example
The fermentation of grapes produces wine.
葡萄的发酵产生葡萄酒。
C1 verb /ˈfɔːrfɪt/

forfeit

Meaning
to lose or give up something, usually as a penalty for wrongdoing
Example
He had to forfeit the match after breaking the rules.