A2 noun /ˈθiːətər/

theater

剧院

Meaning

a building or area for dramatic performances

Example

We are going to the theater tonight.

我们今晚要去剧院。

A2 noun /ˈdeɪn.dʒər/

danger

危险

Meaning

The possibility of harm, injury, or loss.

Example

The hikers were in great danger during the storm.

徒步旅行者在暴风雨中处于极大危险中。

A2 noun /ˌkæŋ.ɡəˈruː/

Kangaroo

袋鼠

Meaning

a large marsupial from Australia that moves by hopping on its strong hind legs

Example

The kangaroo jumped high with its joey in its pouch.

袋鼠跳得很高，带着它的小袋鼠。

A2 noun breɪn

brain

大脑

Meaning

The organ inside the head that controls thought, memory, feelings, and activity

Example

The brain can only focus on one thing at a time.

大脑一次只能专注于一件事。

A2 noun /ˈfer.i.teɪl/

Fairy-tale

童话故事

Meaning

a children's story about magical and imaginary beings and lands

Example

Children love listening to fairy-tales before bedtime.

孩子们喜欢在睡觉前听童话故事。

A2 verb /prɪˈfɜːr/

prefer

偏爱

Meaning

to like better; to choose as more desirable

Example

I prefer tea over coffee in the morning.

早上我喜欢喝茶而不是咖啡。

A2 verb /dəˈrɛkt/ or /daɪˈrɛkt/

direct

指导

Meaning

to manage or control the course of something; to give instructions

Example

She directed the team to complete the project on time.

她指示团队按时完成项目。

A2 noun /ˈmɛs.ɪdʒ/

Message

信息

Meaning

A written, spoken, or electronic communication sent from one person to another

Example

I received your message and will reply soon.

我收到了你的信息，很快会回复。

A2 noun /rɪˈfrɪdʒ.ər.eɪ.tər/

Refrigerator

冰箱

Meaning

an appliance for keeping food and drinks cold

Example

Please put the milk in the refrigerator to keep it fresh.

请把牛奶放进冰箱里保持新鲜。

A2 noun /prəˈfɛsər/

professor

教授

Meaning

a senior teacher or academic at a college or university

Example

The professor explained the theory clearly.

教授清楚地解释了理论。

A2 noun /seɪl/

sale

促销

Meaning

the exchange of a commodity for money; the action of selling something

Example

The store is having a sale on winter clothing.

商店正在进行冬季衣物的促销。

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。

A2 verb /kəˈlɛkt/

collect

收集

Meaning

to gather together; to accumulate items

Example

I collect stamps as a hobby.

我把收集邮票作为一种爱好。

A2 adjective /ˈwɛstərn/

western

西方的

Meaning

relating to or characteristic of the West, especially Europe and the Americas

Example

She loves western music and culture.

她喜欢西方的音乐和文化。

A2 noun /bel/

Bell

钟

Meaning

a hollow metal device that makes a ringing sound when struck

Example

The church bell rang at noon.

教堂的钟声在中午响起。

A2 adjective /ˈnæsti/

nasty

令人不快的

Meaning

very unpleasant, unkind, or offensive

Example

He made a nasty comment about her dress.

他对她的裙子发表了令人不快的评论。

A2 adjective kɑːm

calm

平静

Meaning

Not showing or feeling nervousness, anger, or other strong emotions; peaceful.

Example

The calm environment supports healing.

安静的环境有助于康复。

A2 noun /ˈdɪfərəns/

difference

区别

Meaning

A point or way in which things are not the same.

Example

There is a big difference between theory and practice.

理论和实践之间有很大的区别。

A2 noun /ˈmaɪkroʊweɪv/

Microwave

微波炉

Meaning

an electric oven that uses electromagnetic radiation to heat food quickly

Example

She heated the leftover pizza in the microwave for two minutes.

她把剩余的披萨放进微波炉加热了两分钟。

A2 pronoun /huːz/

whose

谁的

Meaning

used to ask or talk about the person or thing that owns something

Example

The girl whose phone was stolen is my cousin.

那个女孩，手机被偷了，是我的表妹。

A2 noun /ˈvɪzɪtər/

visitor

游客

Meaning

a person who goes to see a place or someone for a short time

Example

The museum had many visitors last weekend.

博物馆上周末有很多游客。

A2 noun /dəˈrɛkʃən/ or /daɪˈrɛkʃən/

direction

方向, 指令

Meaning

the course or path on which someone or something is moving; instructions on what to do

Example

He asked for directions to the train station.

他询问了去火车站的方向。

A2 noun /ˈprɪzən/

prison

监狱

Meaning

a building where people are kept as punishment for a crime or while waiting for trial

Example

He was sent to prison for his crimes.

他因犯下罪行而被送进监狱。

A2 noun /ɡɒlf/

golf

幸福

Meaning

A game in which players use clubs to hit a ball into a series of holes on a course in as few strokes as possible.

Example

He spends his weekends playing golf with his friends.

当她收到奖项时，她无法掩饰自己的幸福。

A2 noun /kriːm/

Cream

奶油

Meaning

the thick white or pale yellow fatty liquid that rises to the top of milk

Example

She whipped the cream until it became fluffy.

她打发奶油，直到它变得蓬松。

A2 noun /stɛə/

stair

楼梯

Meaning

a step or set of steps leading from one level to another

Example

He tripped on the stair and fell down.

他在楼梯上绊倒摔了下来。

A2 proper noun /ˌsaʊθ əˈmɛrɪkə/

south america

南美洲

Meaning

a continent located in the Western Hemisphere, mostly in the Southern Hemisphere

Example

Brazil is the largest country in South America.

巴西是南美洲最大的国家。

A2 noun /ˈfrɛndʃɪp/

friendship

友谊

Meaning

A close and trusting relationship between two or more people.

Example

Their friendship has lasted since childhood.

他们的友谊从小就开始了。

A2 verb, noun /drɒp/

drop

掉 / 水滴

Meaning

to let something fall; a small quantity of liquid

Example

Be careful not to drop your phone.

小心不要把手机掉了。

A2 adjective /ˈmoʊbaɪl/

mobile

移动

Meaning

Able to move or be moved easily; also refers to portable communication devices.

Example

She prefers a mobile lifestyle that allows her to travel frequently.

她更喜欢一种移动的生活方式，这让她可以频繁旅行。

A2 noun /staɪl/

Style

风格

Meaning

a particular way of doing something; a distinctive appearance or manner of expression

Example

She has her own unique style of writing that captivates readers.

她有自己独特的写作风格，吸引了读者。

A2 adjective /ˈpeɪ.ʃənt/

Patient

幸福

Meaning

able to wait calmly; tolerant

Example

She was very patient with her young students.

当她收到奖项时，她无法掩饰自己的幸福。

A2 verb /dɪˈskraɪb/

describe

描述

Meaning

to give an account of something in words, including details

Example

She described the scene vividly.

她生动地描述了场景。

A2 verb /taɪp/

type

打字

Meaning

to write using a keyboard or typewriter

Example

She can type very fast on the computer.

她可以在电脑上非常快地打字。

A2 adjective /ʌnˈhæp.i/

Unhappy

不快乐; 难过

Meaning

not happy; feeling sad or displeased; unfortunate or undesirable

Example

He was unhappy with the results of his exam.

他对考试结果感到不满。

A2 adjective /ˈprɒpər/

proper

适当的

Meaning

conforming to accepted standards of behavior or morality

Example

He made sure to wear proper attire for the interview.

他确保为面试穿上了适当的服装。

A2 noun /pɪn/

pin

别针

Meaning

a small thin piece of metal used to fasten or hold things together

Example

She used a pin to attach the note to the board.

她用别针把纸条固定在黑板上。

A2 adverb /ˈnaɪsli/

nicely

很好地

Meaning

in a pleasant, kind, or satisfactory manner; carefully and appropriately

Example

She explained the problem nicely so everyone could understand.

她把问题解释得很好，让大家都明白了。

A2 adjective /ˈreɪ.ni/

Rainy

多雨的

Meaning

characterized by rain; wet from rain; having much rain

Example

It was a rainy day, so we stayed indoors.

这是一个多雨的日子，所以我们待在室内。

A2 noun /ˈkɒnsət/

concert

音乐会

Meaning

A musical performance given by one or more singers or musicians.

Example

We went to a concert last night and enjoyed the live music.

我们昨晚去了一场音乐会，并享受了现场音乐。

A2 noun /ˈpleɪər/

player

球员

Meaning

a person who participates in a game or sport

Example

The player scored the winning goal.

球员打入了制胜球。

A2 noun /ˈbʊkʃɒp/

bookshop

书店

Meaning

a retail store where books are sold

Example

She spent an hour browsing in the small bookshop.

她在那家小书店里逛了一个小时。

A2 noun (plural) /ˈnuːdəlz/

noodles

面条

Meaning

long, thin strips of dough made from flour, water, or eggs, cooked and eaten as food

Example

She cooked noodles with vegetables for dinner.

她做了蔬菜面条当晚餐。

A2 noun /ækˈtɪv.ə.ti/

Activity

活动; 行动; 任务

Meaning

something that you do for interest or pleasure, or in order to achieve a particular aim

Example

Physical activity is important for good health.

体育活动对保持健康非常重要。

A2 adjective /ɪkˈspɛnsɪv/

expensive

Meaning

costing a lot of money

Example

That car is too expensive for me to buy.

A2 noun /ˈmæŋ.ɡoʊ/

Mango

芒果

Meaning

a tropical fruit with yellow-orange skin and sweet juicy flesh

Example

The mango is known as the king of fruits.

芒果被誉为水果之王。

A2 verb /dɪˈzaɪn/

design

Meaning

to plan and create something with a particular purpose or look

Example

She will design the new company logo.

A2 noun/verb /kənˈsɜːrn/

concern

Meaning

to relate to or affect; a matter of worry or interest

Example

Environmental issues concern all of us.

A2 noun /ˈtiːtʃɪŋ/

teaching

教学

Meaning

the profession or practice of teaching

Example

Teaching is a noble profession.

教学是一项高尚的职业。

A2 adjective /ˈhɔːrəbəl/

Horrible

可怕的; 恐怖的; 骇人的;

Meaning

causing or likely to cause horror; shocking; terrible; extremely unpleasant

Example

The accident was a horrible sight to witness.

这场事故是一个可怕的景象，令人无法忍受。

A2 noun /ˈwɜːrkər/

worker

工人

Meaning

a person who is employed to perform tasks or duties

Example

The workers were busy building the bridge.

工人们忙着建造桥梁。

A2 adjective /maɪˈnuːt/

Minute

极小的; 微小的; 详细的; 精确的

Meaning

extremely small; tiny; detailed; precise

Example

The scientist examined minute details under the microscope.

科学家在显微镜下检查了微小的细节。

A2 noun /ˈkʌp.bɔːrd/

Cupboard

橱柜

Meaning

a piece of furniture with doors and shelves for storing dishes, food, or clothes

Example

She stored all the plates and bowls in the kitchen cupboard.

她把所有的盘子和碗放进了厨房的橱柜里。

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。

A2 verb /kənˈsɪdər/

consider

考虑

Meaning

to think carefully about something, especially before making a decision

Example

She is considering studying abroad next year.

她正在考虑明年出国留学。

A2 noun /ˈseɪf.ti/

Safety

安全

Meaning

condition of being protected from danger, risk, or injury

Example

The company prioritizes workplace safety above all else.

公司将工作场所的安全置于一切之上。

A2 noun /ədˈvæn.tɪdʒ/

Advantage

优势; 利益

Meaning

a condition or circumstance that puts one in a favorable position; a benefit

Example

Having a college degree gives you an advantage in the job market.

拥有大学学位可以在就业市场上为您提供优势。

A2 noun /ˈpɛpər/

pepper

胡椒

Meaning

a pungent spice obtained from pepper plants, used to flavor food

Example

I like to add pepper to my soup.

我喜欢在我的汤里加胡椒。

A2 noun /ʃɛlf/

shelf

架子

Meaning

a flat surface used for storing or displaying things, typically fixed to a wall or inside a cabinet

Example

I placed the books on the shelf next to the window.

我把书放在靠窗的架子上。

A2 pronoun /ðəmˈsɛlvz/

themselves

自己

Meaning

used to emphasize the subject of the sentence or to refer to the subject doing something to itself

Example

They fixed the problem themselves.

他们自己解决了问题。

A2 verb /ˈdraɪvɪŋ/

driving

驾驶

Meaning

the act of controlling and operating a vehicle; guiding or motivating something forward

Example

She loves driving along the coast on weekends.

她喜欢在周末沿着海岸驾驶。

A2 noun /ˈfəʊtəɡrɑːf/

photograph

照片

Meaning

a picture made using a camera

Example

She took a photograph of the sunset.

她拍了一张日落的照片。

A2 conjunction /ˈniːðər/

neither

既不

Meaning

used to connect two negative alternatives

Example

Neither the manager nor the assistant could attend the meeting.

经理和助理都无法参加会议。

A2 noun /ˈmiːnɪŋ/

Meaning

意义; 目的

Meaning

What is meant by a word, text, or concept; significance or purpose

Example

The teacher explained the meaning of the difficult word to the students.

老师向学生解释了这个难单词的意思。

A2 verb /fɪks/

fix

Meaning

To repair or make something work again.

Example

The mechanic fixed the broken car.

A2 verb /dɪˈstrɔɪ/

destroy

摧毁

Meaning

to damage something so badly that it cannot be used

Example

The fire destroyed the entire building.

火灾摧毁了整个建筑。

A2 noun /ˈmoʊ.mənt/

Moment

时刻

Meaning

a very brief period of time; an exact point in time

Example

Please wait a moment while I check your order.

请稍等片刻，我检查您的订单。

A2 adjective /θɪk/

Thick

厚的; 密的;

Meaning

having a large distance between opposite sides; dense; not thin

Example

The book has thick pages and a heavy cover.

这本书有厚重的页面和沉重的封面。

A2 noun /kɔːrn/

Corn

玉米

Meaning

a tall cereal plant that produces kernels on large ears; maize

Example

We grilled corn on the cob for dinner.

我们在晚餐时烤了玉米棒。

A2 noun /ɡeɪt/

gate

幸福

Meaning

A movable barrier that opens and closes to allow or prevent entry through an opening.

Example

She closed the gate behind her as she left the garden.

当她收到奖项时，她无法隐藏自己的幸福。

A2 verb /ˌrɛkəˈmɛnd/

recommend

latest

events

事件

Meaning

A thing that happens, especially one of importance.

Example

Several events were held across the country.

全国范围内举行了几个事件。

A2 verb /heɪt/

hate

讨厌

Meaning

to feel intense dislike or aversion for someone or something

Example

I hate waiting in long lines.

我讨厌在长队里等待。

A2 verb /ˈmænɪdʒ/

manage

管理

Meaning

to control or organize something; to succeed in doing something difficult

Example

He manages a team of twenty employees effectively.

他有效地管理着二十名员工。

A2 noun /stoʊn/

stone

石头

Meaning

a hard, naturally occurring mineral material found in the earth

Example

He threw a stone into the lake.

他把一块石头扔进湖里。

A2 noun /veɪˈkeɪ.ʃən/

Vacation

假期

Meaning

a period of time when someone does not go to work or school but is free to do what they want, such as travel or relax

Example

I'm planning a vacation to the beach next summer.

我计划明年夏天去海滩度假。

A2 noun /ɪˈkwɪpmənt/

equipment

设备

Meaning

the necessary tools, machines, or other items needed for a particular purpose

Example

The laboratory bought new equipment for research.

实验室购买了新的设备用于研究。

A2 noun /ˈden.tɪst/

Dentist

牙科医生

Meaning

a medical professional who treats teeth and oral health

Example

I need to visit the dentist for a regular checkup.

我需要去看牙医进行定期检查。

A2 pronoun /ðɛərz/

theirs

他们的

Meaning

belonging to them; that which is theirs

Example

This book is theirs, not ours.

这本书是他们的，不是我们的。

A2 noun /ˈtraɪ.sɪ.kəl/

Tricycle

三轮车

Meaning

a three-wheeled vehicle, especially one for children

Example

The child rode his tricycle in the park.

孩子在公园骑着三轮车。

A2 adjective /ˈɑp.ə.zɪt/

Opposite

相反的; 完全不同的; 面对面; 反向的;

Meaning

Contrary; completely different; facing each other; reverse;

Example

They have opposite views on politics but remain good friends.

他们在政治上的观点相反，但仍然是好朋友。

A2 noun /nek/

Neck

脖子

Meaning

the part of the body connecting the head to the shoulders

Example

She wore a beautiful necklace around her neck.

她在脖子上戴着一条美丽的项链。

A2 noun /ˈmiːtɪŋ/

meeting

会议

Meaning

A gathering of people for discussion or decision-making.

Example

The board had a meeting to finalize the budget.

董事会举行了会议来完成预算。

A2 adjective/adverb /ˈɒnˌlaɪn/

online

在线

Meaning

connected to or available through the internet

Example

I prefer shopping online rather than going to stores.

我更喜欢网上购物，而不是去商店。

A2 noun /ɪkˈskjuːs/

Excuse

借口

Meaning

a reason or explanation put forward to defend or justify a fault or offense

Example

Being tired is not a valid excuse for not completing your homework.

疲劳不是一个有效的借口，不能完成作业。

A2 noun /ˈsoʊʃəl ˈmiːdiə/

social media

社交媒体

Meaning

Websites and applications that enable users to create and share content or to participate in social networking.

Example

Social media often causes delays.

社交媒体经常造成延迟。

A2 verb /ˈentər/

enter

进入

Meaning

to go into; to come or go inside

Example

Please knock before you enter the room.

请在进入房间之前敲门。

A2 noun /ˈtɒpɪk/

topic

主题

Meaning

a subject of conversation, discussion, or writing

Example

The topic of the meeting was company expansion.

会议的主题是公司扩展。

A2 noun /ˈtiːneɪdʒər/

teenager

青少年

Meaning

a person aged between 13 and 19 years.

Example

Teenagers often enjoy hanging out with friends.

青少年常常喜欢和朋友一起度过时光。

A2 noun /ˈpɪərɪəd/

period

时期

Meaning

a length or portion of time

Example

The meeting will last for a period of two hours.

会议将持续两个小时的时间段。

A2 noun, verb /fɔːrm/

form

形状 / 表格

Meaning

the shape or structure of something; to bring something into existence

Example

Students filled out the registration form.

学生填写了注册表格。

A2 noun /koʊt/

Coat

外套

Meaning

an outer garment worn over other clothes for warmth or protection

Example

He put on his winter coat before going outside.

他在出门前穿上了冬季外套。

A2 noun ˈpræktɪs

practice

练习

Meaning

The actual application or use of an idea, belief, or method; repeated exercise in or performance of an activity or skill.

Example

Daily practice improves fluency.

每天的练习能提高流利度。

A2 noun /bɔːrd/

board

Meaning

a flat, thin, rectangular piece of material such as wood; also a group of people managing an organization

Example

The board decided to increase the budget.

A2 noun /ˈsæd.nəs/

Sadness

悲伤，痛苦，忧郁

Meaning

feeling of sorrow, unhappiness, or grief

Example

Her sadness was evident after hearing the bad news.

她听到坏消息后，她的悲伤显而易见。

A2 noun /teɪl/

Tail

尾巴

Meaning

the rear part of an animal that extends from the back or bottom

Example

The dog wagged its tail happily when it saw its owner.

狗看到主人时高兴地摇了摇尾巴。

A2 adjective /sər'praɪz.ɪŋ/

Surprising

令人惊讶的; 出人意料的

Meaning

causing surprise; unexpected; remarkable

Example

It's surprising how quickly children learn new languages.

令人惊讶的是，孩子们学新语言的速度有多快。

A2 noun /spɒt/

spot

地点

Meaning

a particular place or position

Example

I found a great spot for a picnic in the park.

我在公园里找到了一个很好的野餐地点。

A2 noun /tiːm/

team

团队

Meaning

a group of people working together towards a common goal

Example

Our team won the match after a great effort.

我们的团队在一次巨大努力后赢得了比赛。

A2 adjective /dʌtʃ/

dutch

荷兰的

Meaning

relating to the Netherlands, its people, or their language

Example

She enjoys Dutch paintings from the 17th century.

她喜欢17世纪的荷兰画作。

A2 verb /nɜːrs/

nurse

护理

Meaning

to care for someone who is sick or injured; to feed a baby

Example

She nursed her sick mother back to health.

她照顾了生病的母亲，直到她恢复健康。

A2 adjective /ˈnɔɪ.zi/

Noisy

吵闹

Meaning

making a lot of loud or unpleasant sound; clamorous

Example

The noisy construction work outside made it difficult to concentrate.

外面的吵闹施工工作使得集中精神变得困难。

A2 adjective /ʌnˈhel.θi/

Unhealthy

不健康的; 有害的

Meaning

harmful to health; not in good health; detrimental to well-being

Example

Eating too much fast food is unhealthy for your body.

吃太多快餐对你的身体不健康。

A2 noun /ˈdæn.sər/

Dancer

舞蹈家

Meaning

a person who performs dance, typically as a profession or art form

Example

The dancer performed gracefully on the stage.

舞蹈家在舞台上优雅地表演。

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。

A2 noun /ˈkrɒk.ə.daɪl/

Crocodile

鳄鱼

Meaning

a large reptile with a long mouth and sharp teeth that lives in rivers and lakes in hot countries

Example

The crocodile slowly moved through the murky water.

鳄鱼缓慢地穿过浑浊的水域。

A2 verb /rɪŋ/

ring

铃声

Meaning

to make a clear sound like a bell; to call by telephone

Example

The bell rings every hour.

钟每小时响。

A2 adjective /ˈpʌblɪk/

public

公共的

Meaning

relating to or affecting the people as a whole

Example

The public demanded action on the issue.

公众要求对此问题采取行动。

A2 noun /haɪt/

height

高度

Meaning

the measurement of someone or something from base to top

Example

The height of the tower impressed the visitors.

塔的高度给游客留下了深刻的印象。

A2 noun /ˈdɪkʃəˌnɛri/

dictionary

字典

Meaning

A reference book or electronic resource containing words, usually arranged alphabetically, with information about their meanings, pronunciations, etymologies, and usage.

Example

I looked up the word in the dictionary to understand its meaning.

我在字典里查了这个词的意思。

A2 adjective /ɪmˈbærəst/

embarrassed

尴尬

Meaning

feeling awkward, ashamed, or self-conscious about something

Example

He felt embarrassed when he forgot her name.

当他忘记她的名字时，他感到尴尬。

A2 verb /əkˈsɛpt/

accept

接受

Meaning

to receive willingly; to believe or come to recognize

Example

She decided to accept the job offer.

她决定接受这份工作邀请。

A2 noun /tɛkst/

text

文本

Meaning

a written or printed work or passage, especially a book or document

Example

The teacher asked us to read the text on page 50.

老师让我们阅读第50页上的文本。

A2 noun /ræt/

Rat

老鼠

Meaning

a large long-tailed rodent that is typically considered a pest

Example

The rat scurried across the kitchen floor.

老鼠在厨房的地板上快速跑过。

A2 noun /frɒɡ/

Frog

青蛙

Meaning

a small amphibian animal that lives both in water and on land

Example

The frog jumped from the lily pad into the pond.

青蛙从睡莲叶上跳进池塘。

A2 noun /brɛθ/

breath

呼吸

Meaning

The air taken into or expelled from the lungs during breathing.

Example

He took a deep breath before speaking.

他在讲话前深深地吸了一口气。

A2 adjective /niːt/

Neat

干净整洁; 井然有序; 精心制作

Meaning

clean and tidy; well-organized; carefully done

Example

Her room is always neat and organized.

她的房间总是整洁有序。

A2 noun /mjuːˈzɪʃən/

musician

音乐家

Meaning

a person who plays a musical instrument or is musically talented

Example

He is a talented musician.

他是一个才华横溢的音乐家。

A2 adjective /meɪn/

main

主要的

Meaning

most important; chief in size, extent, or importance

Example

The main reason for his success is hard work.

他成功的主要原因是努力工作。

A2 noun ˈtʃælɪndʒ

challenge

挑战

Meaning

A call to take part in a contest or competition, especially a demanding or stimulating one; a task or situation that tests someone's abilities.

Example

Plastic pollution poses a significant challenge to global health.

塑料污染对全球健康构成了重大挑战。