future generations
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B2 noun ˈfjuː.tʃɚ ˌdʒen.əˈreɪ.ʃənz

future generations

未来几代人
Meaning
People who have not yet been born, considered in terms of the environment or society they will inherit.
Example
Sustainable development ensures a better life for future generations.
可持续发展确保未来几代人更好的生活。
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！
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。
B2 noun ˈflaɪ.ɪŋ kɑːrz

flying cars

飞行汽车
Meaning
Vehicles that can travel both on roads and in the air.
Example
Flying cars could soon solve urban traffic congestion.
飞行汽车很快就能解决城市交通拥堵问题。
B2 noun /ˈfræɡ.mənt/

Fragment

碎片; 片段;
Meaning
a small part broken or separated off something; an incomplete or isolated portion
Example
Archaeologists found fragments of ancient pottery buried in the soil.
考古学家在土壤中发现了古代陶器的碎片。
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。
A2 noun /ˈfɪɡ.jər/

Figure

数字; 形象; 数量;
Meaning
a number, especially one which forms part of official statistics; the shape of a human body
Example
The sales figure for this quarter exceeded all expectations.
这个季度的销售数字超过了所有的预期。
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。
B2 verb /ˈfɜːrnɪʃ/

furnish

布置, 提供
Meaning
to provide or supply with furniture or equipment
Example
They furnished the new house with modern furniture.
他们用现代家具布置了新房。
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。
A1 verb /fɔːl/

fall

掉落
Meaning
to drop down from a higher place; to decrease; to happen or occur
Example
The leaves fall from the trees in autumn.
秋天，树叶从树上掉下来。
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 noun /faɪv/

five

五
Meaning
The number 5; one more than four and one less than six.
Example
She bought five apples from the market.
她从市场买了五个苹果。
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。
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。
C1 noun /ˈfræk.tʃər/

Fracture

骨折; 骨裂
Meaning
the cracking or breaking of a hard object or material; a break in a bone
Example
The doctor confirmed that he had a hairline fracture in his wrist.
医生确认他在手腕上有一条细小的骨折。
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 /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。
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。
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 verb /ˈflʌtər/

flutter

拍动 / 颤动
Meaning
to move or flap quickly and lightly; to beat or wave with small rapid motions
Example
The butterfly began to flutter its wings in the sunlight.
蝴蝶开始在阳光下扑动它的翅膀。
A2 adverb, adjective, verb, noun /ˈfɔːrwərd/

forward

向前
Meaning
toward the front; to advance or send ahead; an onward position or direction
Example
The troops moved forward to secure the bridge.
部队向前移动以确保桥梁的安全。
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。
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。
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。
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。
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。
B2 noun /foʊm/

Foam

泡沫
Meaning
a mass of small bubbles formed on or in liquid; frothy white mass
Example
The waves crashed against the rocks, creating white foam on the shore.
波浪撞击岩石，形成了岸边的白色泡沫。
B2 noun, verb /ˈfaɪlɪŋ/

filing

提交文件; 整理文件
Meaning
the act of submitting documents; the process of organizing papers
Example
The lawyer handled the filing of all court documents.
律师处理了所有法院文件的提交。
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 /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。
B1 noun/verb /ˈfaɪtɪŋ/

fighting

战斗
Meaning
the act of engaging in a physical or verbal conflict
Example
The soldiers were fighting bravely on the battlefield.
士兵们在战场上英勇作战。
B2 adverb /ˈfɔːrməli/

formally

正式地
Meaning
in a formal or official manner; according to established rules or conventions
Example
The agreement was formally signed by both parties.
该协议已由双方正式签署。
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。
A2 noun /fluː/

flu

流感
Meaning
a contagious viral illness causing fever, aches, and respiratory symptoms; influenza
Example
She stayed home because she had the flu.
她因为得了流感待在家里。
B1 adjective /ˈfriːkwənt/

Frequent

频繁
Meaning
happening often; occurring regularly; repeated
Example
He makes frequent visits to his grandmother.
他经常去看望他的祖母。
C2 adjective /ˈfraʊzi/

frowsy

邋遢
Meaning
Scruffy and neglected in appearance; musty or stale in smell.
Example
He wore a frowsy old jacket that smelled of damp.
他穿着一件邋遢的旧夹克，散发着潮湿的气味。
B2 adjective /fəˈbɪd.ən/

Forbidden

禁止的; 非法的
Meaning
not allowed; prohibited; banned
Example
Smoking is strictly forbidden in this building.
在这座建筑物内，吸烟是严格禁止的。
C2 adjective /ˈfɛstəl/

festal

节日的，庆祝的
Meaning
relating to a festival or celebration
Example
The hall was decorated in a festal manner for the wedding.
婚礼的大厅被装饰得节日气氛十足。
C2 adjective /ˈflæs.ɪd/

Flaccid

软弱的; 无力的; 松弛的;
Meaning
soft and limp; lacking firmness; drooping
Example
The plant's leaves became flaccid after days without water.
在没有水的几天后，植物的叶子变得软弱无力。
B1 noun, verb /flæɡ/

flag

Meaning
a piece of fabric with a symbol or colors; or to mark or signal attention
Example
They raised the national flag during the ceremony.
C2 noun /ˈfrækɑː/

fracas

纷争
Meaning
A noisy disturbance or quarrel.
Example
The fracas outside the bar drew the attention of the police.
酒吧外的纷争引起了警察的注意。
C2 verb /flɛdʒ/

fledge

飞翔
Meaning
To develop wing feathers large enough for flight; to bring up until able to fly.
Example
The young birds will fledge in a few weeks.
年轻的鸟将在几周内学会飞行。
B2 noun /fluːt/

Flute

长笛
Meaning
a musical wind instrument with holes along its length that is played by blowing across a hole at one end
Example
He played a sweet melody on his flute.
他在他的长笛上演奏了一首甜美的旋律。
C2 noun /ˈfetiʃ/

fetich

费蒂什
Meaning
an object believed to have magical powers or to be inhabited by a spirit
Example
The villagers treated the statue as a powerful fetich.
村民把雕像视为一个强大的费蒂什。
C2 adjective /ˈflæb.i/

Flabby

松软且松弛; 缺乏紧实或肌肉张力; 虚弱
Meaning
soft and loose; lacking firmness or muscle tone; weak
Example
His flabby arms showed he needed to exercise more.
他松弛的手臂显示他需要更多的锻炼。
A2 adjective /fɪfθ/

fifth

第五
Meaning
constituting number five in a sequence
Example
She lives on the fifth floor of the building.
她住在大楼的第五层。
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。
C2 noun /feɪt/

fete

节日，庆典
Meaning
a celebration or festival, often in honor of someone
Example
The village held a grand fete to celebrate the harvest.
村庄举行了盛大的节日庆典来庆祝丰收。
C2 noun /ˈflɛdʒlɪŋ/

fledgeling

初生小鸟
Meaning
A young bird that has just developed its feathers and is learning to fly; a beginner.
Example
The fledgeling was trying hard to take its first flight.
那只初生小鸟正在努力做第一次飞行。
B2 noun /ˈfeɪbəl/

fable

寓言
Meaning
a short story, typically featuring animals as characters, that conveys a moral lesson
Example
Aesop’s fables are famous for teaching valuable lessons through simple stories.
伊索的寓言通过简单的故事传授宝贵的教训。
B1 noun /ˈfʌŋkʃən/

function

功能
Meaning
An activity or purpose natural to or intended for a person or thing.
Example
The main function of the heart is to pump blood.
心脏的主要功能是泵送血液。
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 /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。
B2 adverb /fɔːrθ/

forth

向前
Meaning
forward in place, time, or order
Example
The leader stepped forth to address the crowd.
领导走上前去与人群讲话。
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。
B1 adjective /ˈfæsɪneɪtɪŋ/

Fascinating

迷人
Meaning
extremely interesting; captivating; enchanting
Example
The documentary about ocean life was fascinating.
关于海洋生命的纪录片令人着迷。
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。
B2 adverb /ˌfʌndəˈmɛntəli/

fundamentally

从根本上
Meaning
in a basic and important way; at the core
Example
The two theories are fundamentally different.
这两个理论从根本上不同。
A2 verb /fərˈɡɪv/

forgive

原谅
Meaning
to stop feeling angry or resentful toward someone; to pardon
Example
She decided to forgive him for his mistakes.
她决定原谅他因为他的错误。
C2 verb /frɪz/

frizz

Meaning
to form into small, tight curls or cause hair to become fuzzy and tangled
Example
The humid weather caused her hair to frizz.
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。
A1 verb /flaɪ/

fly

飞行
Meaning
to move through the air using wings or in an aircraft
Example
Birds fly south for the winter.
鸟类冬天飞往南方。
C2 adjective /ˈfɛtɪd/

fetid

有恶臭的，令人不快的
Meaning
having a strong, unpleasant smell
Example
The fetid smell from the garbage was unbearable.
垃圾散发出的恶臭让人无法忍受。
A1 verb /feɪs/

face

mianlin
Meaning
to confront or deal with; to turn toward; to have the front in a particular direction
Example
She had to face many challenges in her new job.
Ta biyao mianlin hen duo tiaozhan zai ta de xin gongzuo zhong.
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。
B1 noun /ˈflaʊər veɪs/

Flower-vase

花瓶
Meaning
a decorative container used to hold cut flowers
Example
She placed beautiful roses in the flower vase on the table.
她把美丽的玫瑰放进了桌子上的花瓶里。
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。
C2 verb /fɔrˈswɛr/

forswear

放弃
Meaning
to renounce or reject; to give up completely
Example
He forswore his old habits and started a new life.
他放弃了旧习惯，开始了新的生活。
B2 noun /ˈfɒsɪl/

fossil

化石
Meaning
the remains or impression of a prehistoric plant or animal embedded in rock
Example
The fossil of a dinosaur was discovered in the mountains.
在山中发现了一只恐龙化石。
B2 adjective /ˈfeɪvərəbl/

favourable

有利的
Meaning
Expressing approval, support, or positivity; advantageous or beneficial
Example
The weather conditions were favourable for the outdoor event.
户外活动的天气条件是有利的。
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。
C2 adjective /fəˈsiːʃəs/

facetious

讽刺的
Meaning
Treating serious issues with deliberately inappropriate humor
Example
He was being facetious when he said he wanted to live on the moon.
他说他想住在月球上时，他是在开玩笑。
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。
A1 noun /ˈfraɪ.deɪ/

friday

星期五
Meaning
the day of the week following Thursday and preceding Saturday
Example
We have a team meeting every Friday afternoon.
我们每个星期五下午都有团队会议。
B1 adjective /ˈfrʌstreɪtɪd/

frustrated

沮丧
Meaning
feeling annoyed or upset because of inability to achieve something
Example
She felt frustrated after failing the exam.
她在考试失败后感到沮丧。
C2 noun /ˈfoʊ.li.oʊ/

folio

大书或手稿
Meaning
A sheet of paper folded once to form two leaves (four pages) of a book; also a term for a large book or manuscript.
Example
The library houses an ancient Shakespeare folio.
图书馆里有一本古老的莎士比亚大书。
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 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。
B1 noun /ˌfɜːrst eɪd kɪt/

first aid kit

急救箱
Meaning
A collection of medical supplies for giving initial treatment in emergencies
Example
I always keep a first aid kit in my car for emergencies.
我总是在车里备有急救箱以应对紧急情况。
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 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。
C2 adjective /ˈfiːbraɪl/

febrile

发烧的，激动的
Meaning
having or showing the symptoms of a fever; or highly excitable or agitated
Example
The patient was in a febrile state with high temperature.
患者处于高温状态下的发烧状态。
B2 adjective /ˈfræʤaɪl/

fragile

脆弱
Meaning
Easily broken or damaged; delicate.
Example
Be careful with that vase, it's very fragile.
小心那个花瓶，它很脆弱。
B2 noun /ˈfæntəsi/

fantasy

幻想
Meaning
a creation of the imagination, especially something improbable or impossible
Example
She has a vivid fantasy about traveling to space.
她有一个关于太空旅行的生动幻想。
B2 adverb /ˈfɜ:rmli/

Firmly

坚决
Meaning
in a strong, steady, and unwavering manner
Example
She firmly believed in her decision.
她坚信自己的决定。
C2 verb /ˈfjuːmɪˌɡeɪt/

fumigate

熏蒸
Meaning
to disinfect or purify an area by using chemical fumes
Example
They fumigated the warehouse to kill the insects.
他们对仓库进行了熏蒸处理，以消灭昆虫。
C2 noun /ˈfɔːrʃɔːr/

foreshore

海滩
Meaning
The part of the shore between the high and low tide marks
Example
Children were playing on the foreshore, collecting shells.
孩子们在海岸上玩耍，捡贝壳。
C1 adjective /fəˈroʊ.ʃəs/

Ferocious

凶猛，残忍，激烈
Meaning
savagely fierce, cruel, or violent; extremely aggressive
Example
The ferocious storm destroyed many houses in the coastal area.
凶猛的暴风摧毁了沿海地区的许多房屋。
B1 verb /ˈfraɪtən/

frighten

吓唬
Meaning
to cause fear or alarm in someone
Example
The loud noise frightened the child.
巨大的噪音吓到了孩子。
A2 adjective /fɔːls/

False

虚假; 错误; 欺骗性; 人造
Meaning
not true; incorrect; deceptive; artificial
Example
The witness gave false testimony in court.
证人给出了虚假的证词。
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。
C2 adjective /ˈflɪpənt/

flippant

轻浮的
Meaning
not showing a serious or respectful attitude
Example
His flippant remarks annoyed the teacher.
他轻浮的言论惹怒了老师。
B2 noun /ˈfeɪ.lɪŋ/

Failing

失败; 缺点; 弱点
Meaning
a weakness, especially in a person's character; a fault
Example
His only failing is that he talks too much during meetings.
他唯一的失败是他在会议中说得太多。
B1 noun /ˈfaɪ.tər/

Fighter

战斗机
Meaning
a military aircraft designed for attacking other aircraft; a person who fights
Example
The fighter jet flew overhead during the military parade.
战斗机在军事游行中飞过我们头顶。
C1 verb /fɔːrˈʃædoʊ/

foreshadow

预示
Meaning
To indicate or suggest something that will happen in the future
Example
Dark clouds foreshadowed an approaching storm.
乌云预示着即将来临的暴风雨。
A1 verb /fərˈɡet/

forget

忘记
Meaning
to be unable to remember something; to fail to bring something to mind
Example
Don't forget to lock the door when you leave.
离开时不要忘记锁门。
A1 noun /frɛnd/

friend

朋友
Meaning
a person with whom one has a bond of mutual affection
Example
He is my best friend.
他是我最好的朋友。
C2 noun /ˈfrɔːdjʊləns/

fraudulence

欺诈
Meaning
The quality or state of being fraudulent; deceitfulness.
Example
The audit revealed fraudulence in the financial statements.
审计揭示了财务报表中的欺诈行为。
A2 adjective, adverb /ˈfʊl taɪm/

full-time

全职
Meaning
working or studying for the whole standard period of time
Example
She works full-time as a teacher.
她作为老师全职工作。
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。
B1 adverb /ˈfeər.li/

Fairly

公正地; 适度地; 合理地
Meaning
in a just manner; moderately; reasonably
Example
The test was fairly easy, but some questions were challenging.
测试相当简单，但一些问题具有挑战性。
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。
B2 verb /fɔːrdʒ/

forge

锻造，伪造
Meaning
to create or shape something, often with effort or skill; also to counterfeit or fake something
Example
The blacksmith forged a strong sword from the iron.
铁匠从铁中锻造出一把坚固的剑。
A2 noun /fɪlm ˈæktər/

film actor

电影演员
Meaning
A person who performs roles in movies or films.
Example
The film actor received widespread acclaim for his performance.
这位电影演员因其出色的表演而获得广泛赞誉。
C2 noun /ˈfɜːrlɔːŋ/

furlong

距离单位（220码或大约201米）
Meaning
a unit of distance equal to 220 yards or about 201 meters
Example
The horse ran a furlong before slowing down.
马跑了一个弗隆后才减速。
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 /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。
A1 noun ˈflaʊərz

Flowers

花
Meaning
The reproductive structures of plants that provide nectar for butterflies.
Example
Butterflies are attracted to colorful flowers.
蝴蝶被五彩斑斓的花朵吸引。
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。
C2 adjective /ˈfʊtˌluːs/

footloose

自由自在
Meaning
Free to go anywhere or do anything; not tied down by responsibilities.
Example
After graduating, he felt footloose and ready to explore the world.
毕业后，他感到自由自在，准备探索这个世界。
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。
B2 noun /ˈfɜːrneɪs/

furnace

炉子
Meaning
an enclosed structure in which heat is produced for a building or for melting metal
Example
The factory's furnace melted the metal quickly.
工厂的炉子迅速融化了金属。
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 /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 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。
C2 noun /ˈfaɪər.brænd/

firebrand

煽动者
Meaning
a person who is passionate about a cause, often inciting change or action
Example
The activist was a true firebrand, inspiring everyone around him to join the protest.
这位活动家是真正的煽动者，激励着周围的每个人参加抗议。
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。
A1 noun /ˈfɛb.ruˌɛr.i/

february

二月
Meaning
The second month of the year in the Gregorian calendar, typically having 28 days, or 29 in a leap year.
Example
My birthday is in February, so I always look forward to this month.
我的生日在二月，所以我总是期待这个月。
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。
B2 adjective /ˌfʌndəˈmɛntl/

fundamental

Meaning
forming a necessary base or core; of central importance
Example
Honesty is a fundamental principle of good leadership.