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A1 adjective /fɑːst/

Fast

快速; 急速
Meaning
moving or happening quickly; rapid; swift
Example
She runs very fast in the morning.
她早上跑得非常快。
A2 verb /friːz/

freeze

冻结
Meaning
to become solid due to cold; to preserve by cold
Example
Water freezes at zero degrees Celsius.
水在零摄氏度下结冰。
B1 noun /feɪθ/

Faith

信念; 信任; 宗教信仰;
Meaning
complete trust or confidence in someone or something; strong belief in religion
Example
She had unwavering faith in her team's ability to succeed.
她对她的团队成功的能力有着坚定不移的信念。
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。
B2 noun /ˈfɛə(r)nɪs/

fairness

公平
Meaning
the quality of being free from bias, favoritism, or injustice
Example
She always strives for fairness in her decisions.
她总是努力在决策中保持公平。
B2 adjective /flɔːd/

flawed

有缺陷的
Meaning
having a mistake or fault that reduces its value or quality
Example
The flawed design of the car led to a recall.
汽车设计有缺陷，导致了召回。
B1 verb /fel/

fell

砍倒, 伐木
Meaning
to cut down a tree; to cause to fall; to strike down
Example
The lumberjacks felled several trees in the forest today.
伐木工今天在森林里砍倒了几棵树。
B2 adjective, noun, verb /faʊl/

foul

Meaning
offensive to the senses; dirty or unpleasant; in sports, an unfair or illegal act
Example
The player was penalized for committing a foul.
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。
B1 noun /ˈfeɪ.ljər/

Failure

失败
Meaning
lack of success; an unsuccessful person, enterprise, or thing
Example
The project's failure was due to poor planning and communication.
项目的失败是由于计划和沟通不良。
C2 verb /foʊˈmɛnt/

foment

煽动
Meaning
To instigate or stir up (an undesirable or violent sentiment or course of action).
Example
The rebel leader tried to foment unrest among the people.
叛乱领袖试图在人民中煽动骚乱。
A1 noun /fruːt/

fruit

水果
Meaning
The sweet and fleshy product of a plant that contains seeds.
Example
Mango is my favorite fruit.
芒果是我最喜欢的水果。
C2 noun /ˈfɔːrˌpiːk/

forepeak

船头舱
Meaning
The compartment in the forward part of a ship, often used for storage.
Example
The sailors stored extra ropes in the forepeak.
水手们将额外的绳索存放在船头舱里。
A1 noun /ˈfriː taɪm/

free time

空闲时间
Meaning
time when a person is not working or occupied and can do activities they enjoy
Example
She likes to read books in her free time.
她喜欢在空闲时间读书。
C1 noun /fæd/

fad

短暂流行的时尚，趋势
Meaning
a temporary fashion or trend; a short-lived craze
Example
The new diet became a popular fad among teenagers.
新的饮食成了青少年中的短暂流行趋势。
B2 noun /ˈfriː.kwən.si/

Frequency

频率
Meaning
the rate at which something occurs or is repeated over a particular period of time
Example
The frequency of earthquakes in this region has increased dramatically over the past decade.
这个地区的地震频率在过去十年中急剧增加。
C2 verb /ˈfrɪtər/

fritter

浪费
Meaning
To waste time, money, or energy on trivial matters.
Example
He frittered away his savings on unnecessary gadgets.
他把储蓄浪费在了不必要的电子产品上。
B2 adverb /ˈfeɪθ.fəl.i/

Faithfully

忠诚地
Meaning
in a loyal and steadfast manner; with dedication
Example
She faithfully attended every meeting despite her busy schedule.
她忠实地参加了每一次会议，尽管她的日程非常紧张。
A2 noun/adjective /ˈfiːmeɪl/

female

雌性
Meaning
a person or animal of the sex that can bear offspring; relating to women or girls
Example
The female lion protects her cubs fiercely.
母狮保护她的幼崽。
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 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。
B2 noun /ˈfɛmənɪst/

feminist

女性主义者
Meaning
a person who supports equal rights and opportunities for women and men
Example
She proudly calls herself a feminist and fights for gender equality.
她自豪地称自己为女性主义者，并为性别平等而奋斗。
B2 adjective /fəˈɡɪv.ɪŋ/

Forgiving

宽容
Meaning
ready and willing to forgive; merciful; lenient
Example
She has a forgiving nature and rarely holds grudges.
她有宽容的天性，几乎不记仇。
B1 noun freɪm

Frame

框架
Meaning
A rigid structure that surrounds something such as a picture, door, or windowpane.
Example
A framed family tree can be displayed in your home.
一个框架化的家谱可以在您的家中展示。
B2 adjective /fɔːrˈsiːəbl/

foreseeable

可预见的
Meaning
Able to be predicted or expected in advance
Example
The company is unlikely to make changes in the foreseeable future.
公司不太可能在可预见的未来做出变化。
A2 adverb/adjective/verb /ˈfɜːrðər/

further

促进
Meaning
At a greater distance; to advance or promote something.
Example
She studied hard to further her career.
她努力学习以推动自己的职业发展。
B2 adverb /ˈfræŋkli/

Frankly

坦率地说; 直言不讳;
Meaning
honestly; openly; in a direct manner
Example
Frankly, I think this plan needs more consideration.
坦率地说，我认为这个计划需要更多的考虑。
C1 noun /ˈfɛtɪʃ/

fetish

过度或不理智的痴迷
Meaning
an excessive or irrational devotion to something
Example
He has a fetish for collecting rare stamps.
他对收集稀有邮票有着一种痴迷。
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。
B1 adjective /feɪld/

failed

失败
Meaning
not successful in achieving a desired result
Example
The project failed to meet the expectations.
项目未能达到预期。
C2 verb /ˈfæmɪʃ/

famish

挨饿
Meaning
to suffer or cause to suffer from extreme hunger
Example
The stranded hikers began to famish after several days without food.
困住的徒步旅行者在没有食物的几天后开始感到饥饿。
B1 noun /flæʃ/

Flash

闪光; 闪烁
Meaning
a sudden brief burst of bright light; a very brief moment
Example
There was a bright flash of lightning followed by thunder.
有一道明亮的闪电，接着是雷声。
B2 noun /frɒk/

Frock

连衣裙
Meaning
a dress, especially a simple or casual one for women or children
Example
The little girl wore a pink frock to her birthday party.
小女孩穿着粉红色的连衣裙参加她的生日派对。
B2 verb /fjuːz/

fuse

熔合
Meaning
To join or blend two or more things together into one.
Example
The two metals fused under high heat.
这两种金属在高温下融合。
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。
C2 noun /ˈfɪli/

filly

小母马
Meaning
a young female horse
Example
The filly ran swiftly across the meadow.
这匹小母马在草地上跑得很快。
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。
A1 noun /faɪər/

Fire

火
Meaning
combustion or burning, in which substances combine chemically with oxygen from the air
Example
The fire in the fireplace provided warmth and a cozy atmosphere.
壁炉中的火提供了温暖和舒适的氛围。
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 /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。
B2 noun /fɔːrt/

Fort

堡垒
Meaning
a strong building or group of buildings where soldiers live and defend
Example
The ancient fort stood on top of the hill for centuries.
古老的堡垒屹立在山顶上数百年。
B2 noun /ˈfɪlmˌmeɪkər/

filmmaker

电影制作人
Meaning
a person who makes films, typically as a profession
Example
He is a well-known filmmaker in the industry.
他是业内著名的电影制作人。
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 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 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。
A1 verb /ˈfɪnɪʃ/

finish

完成
Meaning
to complete or bring to an end; to reach the final point
Example
She finished her homework before dinner.
她在晚餐前完成了作业。
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。
B2 noun /fʌs/

Fuss

大惊小怪；无谓的烦恼
Meaning
unnecessary worry or bother about something; agitated excitement over a trivial matter
Example
She made such a fuss about the small stain on her dress that everyone noticed.
她因裙子上的小污点而大惊小怪，结果大家都注意到了。
C2 noun /fluː/

flue

烟道
Meaning
A pipe or channel for smoke and waste gases produced by a fire, gas heater, or power station.
Example
The chimney flue needs to be cleaned regularly.
烟囱的烟道需要定期清理。
A2 verb /fiːd/

feed

喂
Meaning
to give food to a person or animal
Example
She feeds the birds every morning.
她每天早上喂鸟。
A2 adjective /flæt/

flat

平坦
Meaning
Smooth and level, without raised areas or curves.
Example
The road ahead was completely flat.
前方的路完全是平坦的。
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。
B1 adjective /ˈfəʊkəst/

focused

专注
Meaning
Directing a great deal of attention or effort toward a particular activity, situation, or person.
Example
Staying focused during work hours enhances productivity.
在工作时间保持专注提高了生产力。
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。
B1 noun /ˈfæktər/

factor

因素
Meaning
A circumstance, fact, or influence that contributes to a result.
Example
Weather is an important factor in crop production.
天气是作物生产中的一个重要因素。
B2 noun /fɪst/

Fist

拳头; 拳击
Meaning
a person's hand when the fingers are bent in toward the palm and held there tightly
Example
He raised his fist in victory after winning the championship match.
他在赢得冠军比赛后举起了拳头。
B2 noun/adjective /ˈfluːɪd/

fluid

液体
Meaning
a substance that can flow easily, such as liquid or gas; smooth and adaptable
Example
The artist's fluid movements impressed the audience.
艺术家的流畅动作给观众留下了深刻的印象。
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。
C2 adjective /ˈfluːviəl/

fluvial

与河流相关
Meaning
relating to or found in a river
Example
The fluvial deposits indicated the presence of an ancient river system.
河流沉积物表明了古老河流系统的存在。
C2 noun /ˈfʌŋkʃəˌnɛri/

functionary

职员
Meaning
a person who has official duties in an organization, especially one with little authority
Example
The minor functionary was responsible for filing reports.
次要的职员负责提交报告。
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 ˌflʌk.tʃuˈeɪ.ʃən

fluctuation

波动
Meaning
An irregular rising and falling in number or amount; a variation.
Example
The stock market experiences frequent fluctuation.
股市经常经历波动。
B2 noun fəˈtiːɡ

fatigue

疲劳
Meaning
Physical or mental exhaustion due to prolonged exertion or mental stress
Example
Lack of sleep leads to extreme fatigue.
缺乏睡眠会导致极度疲劳。
B1 noun /frʌˈstreɪʃən/

frustration

挫折
Meaning
The feeling of being upset or annoyed due to inability to achieve something.
Example
He felt deep frustration when his plans failed.
当他的计划失败时，他感到深深的挫折。
B2 noun /ˈfriːˌlænsər/

freelancer

自由职业者
Meaning
A person who works independently without being permanently employed by one organization.
Example
She works as a freelancer designing websites for different clients.
她作为自由职业者为不同的客户设计网站。
A2 adjective /ˈfraɪtənd/

frightened

害怕的
Meaning
feeling fear or anxiety; scared
Example
The child was frightened by the loud noise.
孩子被巨大的噪音吓到了。
B2 noun /fleʃ/

Flesh

肉
Meaning
the soft substance consisting of muscle and fat that is found between the skin and bones
Example
The doctor examined the wound to check if it had penetrated the flesh.
医生检查了伤口，看看它是否已经穿透了肉体
C2 noun /ˈfriːˌmeɪsən/

freemason

共济会会员
Meaning
A member of an international fraternity known as Freemasonry, focused on moral and spiritual values.
Example
His grandfather was a respected freemason in the community.
他的祖父是社区中受人尊敬的共济会会员。
B1 adverb /ˈfɔːtʃənətli/

fortunately

幸运地
Meaning
by good luck; luckily
Example
Fortunately, no one was injured in the accident.
幸运地，事故中没有人受伤。
B1 noun /ˌfɜːrst ˈeɪd/

first aid

急救
Meaning
Immediate assistance given to a sick or injured person until full medical treatment is available
Example
He gave first aid to the injured cyclist before the ambulance arrived.
在救护车到来之前，他为受伤的自行车手进行了急救。
B2 noun /ˈfluː.ən.si/

fluency

流利
Meaning
The ability to speak or write a language smoothly and effortlessly.
Example
She speaks English with remarkable fluency.
她流利地说英语，令人惊讶。
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。
C2 verb /fɔːrˈdʒʌdʒ/

forejudge

预先判断
Meaning
To judge beforehand without adequate information.
Example
It is unfair to forejudge someone without knowing the facts.
在没有了解事实的情况下对某人做出判断是不公平的。
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 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。
C2 verb /ˈfɛtər/

fetter

束缚，限制
Meaning
to restrain or restrict someone’s freedom
Example
The strict rules fettered the creativity of the students.
严格的规则限制了学生们的创造力。
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。
C2 adjective /ˈfɪt.fəl/

fitful

间歇性
Meaning
occurring in irregular bursts; not continuous or steady
Example
He had a fitful sleep due to the storm.
由于暴风雨，他有间歇性的睡眠。
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。
A2 noun /ˈfiːtʃər/

feature

特点
Meaning
a distinctive attribute or aspect of something; a characteristic
Example
The new phone has a unique camera feature.
新手机具有独特的相机特点。
C2 adjective /ˈfæl.oʊ/

fallow

休耕地
Meaning
Describing land that is left unplanted for a period to restore its fertility, allowing soil to recover nutrients and break pest and disease cycles.
Example
Farmers leave their fields fallow to restore soil fertility.
农民将土地休耕，以恢复土壤肥力。
C1 noun /frɪˈvɒləti/

frivolity

轻浮
Meaning
Lack of seriousness; silly or trivial behavior.
Example
The teacher discouraged frivolity during the exam.
老师在考试期间阻止了轻浮行为。
A1 verb /faɪnd/

find

找到
Meaning
to discover or locate something that was lost or hidden
Example
I can't find my keys anywhere.
我在哪儿都找不到我的钥匙。
B2 verb /ˈflʌrɪʃ/

flourish

Meaning
To grow or develop in a healthy or successful way.
Example
Her business began to flourish after she introduced online sales.
C2 adjective /ˈfʌndʒəbl/

fungible

可替代的
Meaning
interchangeable; able to replace or be replaced by another identical item
Example
In finance, money is considered a fungible asset.
在金融领域，钱被视为一种可替代资产。
C2 noun /ˈflɒtsəm/

flotsam

漂浮的残骸
Meaning
Floating debris from a shipwreck or things discarded and left floating.
Example
The beach was littered with flotsam after the storm.
暴风雨后，海滩上充满了漂浮的残骸。
C2 noun /foʊl fʊt/

Foal-foot

马蹄花
Meaning
a yellow flowering plant with leaves shaped like a horse's hoof, also known as coltsfoot
Example
The foal-foot plant grows wild in many meadows and is often the first flower to bloom in spring.
马蹄花在许多草地上野生生长，通常是春天最早开花的花。
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。
C2 adjective /fluːˈɛnʃəl/

fluential

有影响力的
Meaning
Having the power to influence or flowing freely (rare/archaic usage).
Example
The fluential speaker captivated the entire audience.
有影响力的演讲者吸引了所有观众。
B1 noun /ˈfaɪn.dɪŋ/

finding

发现，经过调查后得出的结论或结果
Meaning
a discovery, conclusion, or result reached after investigation
Example
The scientist published her findings in a leading journal.
科学家在一家领先的期刊上发布了她的发现。
C2 noun /ˌfoʊ.mənˈteɪ.ʃən/

fomentation

煽动，激起
Meaning
The action of instigating or stirring up; also the application of warm substances to the body to ease pain.
Example
His speech led to the fomentation of violence in the region.
他的演讲导致了该地区暴力的激化。
B2 adjective /ˈfɛdərəl/

federal

联邦的
Meaning
Relating to the central government of a federation.
Example
The federal government passed a new law on healthcare.
联邦政府通过了一项关于医疗保健的新法律。
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。
C2 noun /ˌfjuːzɪˈleɪd/

fusillade

齐射
Meaning
A series of shots fired or missiles thrown all at the same time or in quick succession.
Example
The soldiers advanced under a fusillade of bullets.
士兵们在一阵齐射下前进。
C2 adjective /ˈfæsaɪl/

Facile

容易的; 浅显的; 缺乏深度的
Meaning
easily achieved; superficial; lacking depth
Example
His facile explanation didn't address the real problem.
他的简单解释没有解决真正的问题。
C2 noun, verb /ˈfɪlɪˌbʌstər/

filibuster

通过长时间演讲延迟立法行动的策略；使用这种策略
Meaning
a tactic of delaying legislative action by prolonged speech; to use such a tactic
Example
The senator filibustered for hours to prevent the bill from passing.
参议员费利巴斯特了几个小时，以阻止该法案通过。
B1 adjective /ˈfæʃənəbəl/

fashionable

时尚的
Meaning
Following the latest styles or trends in clothing, behavior, or ideas
Example
She always wears fashionable clothes to every party.
她总是在每个派对上穿时尚的衣服。
A2 determiner/adjective /ˈfjuːər/

fewer

更少
Meaning
a smaller number of; not as many
Example
Fewer people attended the meeting than expected.
参加会议的人数比预期的少。
B1 verb /floʊt/

float

浮动
Meaning
to rest or move on the surface of a liquid or in the air without sinking
Example
The boat began to float gently down the river.
船开始轻轻漂浮在河面上。
B1 noun /fɔːlt/

Fault

过错; 错误; 缺陷
Meaning
an unattractive or unsatisfactory feature; responsibility for an accident or misfortune
Example
The accident was caused by a fault in the car's braking system.
事故是由汽车刹车系统的故障引起的。
A2 verb /faɪt/

fight

战斗
Meaning
to engage in battle or combat; to struggle against
Example
The soldiers fight for their country.
士兵为他们的国家而战。
B2 noun /fiːst/

Feast

盛宴; 宴会
Meaning
a large meal, typically one in celebration of something; an annual religious celebration
Example
The wedding feast included traditional dishes from both families' cultures.
婚礼盛宴包括了来自双方家庭文化的传统菜肴。
B1 adjective /ˈfæbjələs/

Fabulous

极好的；不可思议的；非凡的
Meaning
extremely good; wonderful; extraordinary
Example
She wore a fabulous dress to the party.
她穿了一件精彩的裙子去参加派对。
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。
A1 noun /ˈfɑːðər/

father

幸福
Meaning
A male parent of a child.
Example
His father taught him how to ride a bicycle.
她无法隐藏收到奖项时的快乐。
C2 noun /ˈflæɡ ˌɒfɪsər/

flag-officer

旗官
Meaning
a senior naval officer entitled to fly a flag to mark the command
Example
The flag-officer reviewed the fleet before the ceremony.
旗官在仪式前检查了舰队。
B1 adjective /fɪkst/

fixed

固定的，稳定的
Meaning
firmly in place; not changing or movable
Example
The schedule for the meeting is fixed for Monday morning.
会议时间表已定于周一早上。
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！
B2 adjective /ˈfes.tɪv/

Festive

节日的; 欢乐的; 节庆的
Meaning
joyful; celebratory; having the characteristics of a festival
Example
The house looked festive with colorful decorations.
房子看起来很有节日气氛，装饰色彩斑斓。
B1 noun fləʊ

flow

流动
Meaning
The action or fact of moving along in a steady, continuous stream
Example
The flow of information must be secured.
信息流必须被确保。
C2 noun /ˈfriːˌbuːtər/

freebooter

海盗
Meaning
A pirate or plunderer who roams freely in search of wealth.
Example
The freebooter raided the merchant ships along the coast.
海盗袭击了沿海的商船。
B2 noun /ˈfreʃmən/

freshman

大一新生
Meaning
a first-year student at a high school, college, or university
Example
The freshman felt nervous on his first day at university.
大一新生在大学的第一天感到紧张。
B2 verb /flɪp/

flip

翻转
Meaning
to turn over quickly or suddenly; to toss lightly
Example
She flipped the pancake in the pan.
她把煎饼在锅里翻了个面。
A2 adjective /ˈfɔːrməl/

formal

正式
Meaning
done in accordance with rules of convention or etiquette; official or serious in nature
Example
He wore a formal suit to the wedding.
他在婚礼上穿了正式西装。
C2 noun /fɪntʃ/

finch

雀鸟（小型歌唱鸟）
Meaning
a small songbird with a short, stout bill
Example
A colorful finch perched on the branch singing sweetly.
一只五彩斑斓的雀鸟栖息在树枝上，甜美地唱着歌。
C1 noun /ˈfjuː.dʒə.tɪv/

Fugitive

逃犯
Meaning
a person who has escaped from a place or is in hiding, especially to avoid arrest
Example
The police launched a manhunt to capture the fugitive who escaped from prison.
警方展开了追捕行动，试图抓捕从监狱逃跑的逃犯。
C2 verb /feɪz/

faze

打扰
Meaning
to disturb or disconcert someone; to cause to feel unsettled
Example
She was not fazed by the unexpected question.
她没有被意外问题扰乱。
C2 adjective/adverb /feɪn/

fain

心甘情愿地, 乐意地
Meaning
gladly, willingly, or with pleasure
Example
I would fain help you if I had the time.
如果我有时间，我会很乐意帮你。
C2 adjective /ˈfiːbəlˌmaɪndɪd/

feebleminded

愚蠢或心智薄弱
Meaning
lacking intelligence or mental capacity; foolish or weak-minded
Example
The feebleminded man struggled to understand basic instructions.
那个心智薄弱的人很难理解基本的指示。
B1 adjective /ˈfɔːrmər/

former

前任
Meaning
Having been previously in a particular role or position.
Example
He is a former president of the association.
他是该协会的前任主席。
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.