Wolf
All a b c d e f g h i j k l m n o p q r s t u v w x y z
All CEFR A1 A2 B1 B2 C1 C2
Content locale
EN 英语 BN 孟加拉语 HI 印地语 ES 西班牙语 FR 法语 DE 德语 RU 俄语 ZH 中文 JA 日语
All Vocabulary Cards All Vocabularies
A2 noun /wʊlf/

Wolf

狼
Meaning
a wild carnivorous mammal which is the largest member of the dog family
Example
The wolf howled at the full moon.
狼对着满月嚎叫。
A2 noun /pəˈluː.ʃən/

pollution

污染
Meaning
The presence in or introduction into the environment of a substance which has harmful or poisonous effects.
Example
Industrial pollution harms marine life.
工业污染对海洋生物有害。
A2 noun /skɪl/

skill

技能
Meaning
the ability to do something well through training or experience
Example
Her skill in painting impressed everyone.
她在绘画方面的技能给大家留下了深刻印象。
A2 noun /dɪʃ/

Dish

盘子
Meaning
a shallow, flat-bottomed container for cooking or serving food; a particular variety or preparation of food served as part of a meal
Example
Please put the rice on the dish before serving.
请在上菜前将米饭放在盘子里。
A2 noun /ˈtrʌb.əl/

Trouble

麻烦; 问题
Meaning
difficulty or problems; effort or exertion made to do something
Example
The car broke down and caused a lot of trouble for the family.
汽车坏了，给这个家庭带来了很多麻烦。
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, verb, adjective /ˈprɛzənt/

present

呈现
Meaning
existing or happening now; to give something to someone in a formal way
Example
She presented her report to the team yesterday.
她昨天向团队展示了她的报告。
A2 noun /ˈdɒŋ.ki/

Donkey

驴子
Meaning
a domesticated animal related to the horse, with long ears and a braying call
Example
The donkey carried heavy bags up the mountain.
驴子把重袋子背到山上。
A2 noun /ˈbætəri/

battery

电池
Meaning
A device that stores and provides electrical energy; also refers to a group of similar things or repeated blows.
Example
The phone battery ran out after a long day.
手机电池在长时间使用后耗尽了。
A2 adjective /waɪld/

Wild

野生的; 未驯化的
Meaning
living in natural conditions; not domesticated or cultivated; uncontrolled
Example
We saw wild animals in the forest.
我们在森林中看到了野生动物。
A2 verb /rɪˈsiːv/

receive

接收
Meaning
to get or accept something given; to welcome
Example
She receives a gift from her friend.
她从朋友那里收到了一份礼物。
A2 adverb /bɪˈsaɪdz/

Besides

此外
Meaning
in addition to; moreover; furthermore
Example
Besides being smart, he is also kind.
除了聪明，他还很友好。
A2 noun/verb/adjective /ˈsʌbdʒɪkt/ (noun), /səbˈdʒɛkt/ (verb)

subject

主题
Meaning
noun: a topic or theme; verb: to cause to undergo; adjective: dependent or under authority
Example
The teacher introduced a new subject in class.
老师在课堂上介绍了一个新主题。
A2 noun /ʌmˈbrɛlə/

umbrella

伞
Meaning
A device used for protection against rain or sun, typically consisting of a collapsible canopy mounted on a central rod.
Example
She opened her umbrella as it started to rain.
下雨时她打开了她的伞。
A2 noun /ˈæl.fə.bɛt/

alphabet

字母表
Meaning
a set of letters or symbols in a fixed order used to represent the sounds of a language
Example
Children usually learn the alphabet before learning to read words.
孩子们通常在学习阅读单词之前先学习字母表。
A2 preposition /wɪðˈɪn/

within

内部
Meaning
inside the limits of something, or as part of a particular space or time
Example
The keys are within the drawer.
钥匙在抽屉里。
A2 preposition /tɪl/

till

直到
Meaning
up to the time of; until
Example
She waited till midnight for his call.
她等到午夜才接到他的电话。
A2 verb /ɪkˈspekt/

expect

期望
Meaning
to think something will happen; to anticipate
Example
I expect the meeting to start at 9 AM.
我预计会议将在上午9点开始。
A2 noun /ˈpʌp.i/

Puppy

小狗
Meaning
a young dog
Example
The puppy wagged its tail when it saw its owner.
小狗摇着尾巴，当它看到主人时。
A2 noun rɪˈsɜːtʃ

research

研究
Meaning
The systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
Example
Research on radio waves began earlier in India.
关于无线电波的研究在印度早期就开始了。
A2 verb /kɪl/

kill

杀死
Meaning
to cause the death of; to end life
Example
The hunter killed the deer.
猎人杀死了鹿。
A2 verb /ˌdɪsəˈpɪər/

disappear

消失
Meaning
to cease to be visible; to vanish
Example
The magician made the rabbit disappear.
魔术师让兔子消失了。
A2 adverb /ˈnaʊədeɪz/

nowadays

如今
Meaning
At the present time; in contrast with the past.
Example
Nowadays, many people prefer shopping online.
如今，许多人更喜欢在线购物。
A2 noun /ˈmɪljən/

million

百万
Meaning
the number equivalent to one thousand thousand (1,000,000)
Example
The movie earned over a million dollars in its first week.
电影在第一周赚了超过一百万美元。
A2 verb /pʊʃ/

push

推
Meaning
to exert force to move something away from oneself; to press against
Example
Push the button to ring the bell.
按下按钮以响铃。
A2 noun ɪˈmɜː.dʒən.si

emergency

紧急情况
Meaning
A sudden situation that is dangerous or serious and needs immediate attention or action.
Example
A financial emergency can arise at any time.
财务紧急情况可以随时发生。
A2 verb /ɪnˈkri:s/

increase

增加
Meaning
to become or make something larger in amount, number, or degree
Example
The company plans to increase its production this year.
公司计划在今年增加生产。
A2 verb /mætʃ/

match

匹配
Meaning
to be equal to something; to find something that corresponds to another
Example
The colors of her dress match perfectly with her shoes.
她的裙子颜色和鞋子完美匹配。
A2 verb /sɔːrt/

sort

排序
Meaning
to arrange or categorize something
Example
Please sort the files by date.
请按日期排序文件。
A2 verb /prəˈduːs/

produce

生产
Meaning
to make, create, or manufacture something
Example
The factory produces cars.
工厂生产汽车。
A2 adverb /ˈsɜː.tən.li/

Certainly

肯定
Meaning
without doubt; definitely; used to agree or give permission
Example
I will certainly help you with this project.
我一定会帮助你完成这个项目。
A2 adjective /sɪk/

Sick

生病的; 恶心的; 不舒服
Meaning
unwell; having a disease or illness; feeling nauseous
Example
She stayed home from work because she was feeling sick.
她因为感觉不舒服而请假在家。
A2 noun /ˈkɒm.ent/

comment

评论
Meaning
a verbal or written remark expressing an opinion or reaction
Example
She posted a kind comment on my photo.
她在我的照片下留言了一条友好的评论。
A2 noun /ˌɪn.trəˈdʌk.ʃən/

introduction

引言
Meaning
the action of introducing something or someone; an opening or beginning part
Example
The professor gave a brief introduction before starting the lecture.
教授在开始讲座之前做了简短的引言。
A2 noun /dʒɪm/

gym

健身房
Meaning
a place equipped for physical exercise and fitness training
Example
He goes to the gym every morning to work out.
他每天早晨去健身房锻炼。
A2 noun /ˈsɪə.ri.əl/

cereal

Meaning
a common breakfast food made from processed grains such as wheat, oats, or corn
Example
She eats a bowl of cereal every morning before work.
A2 noun /ˈnæpkɪn/

napkin

餐巾
Meaning
a piece of cloth or paper used to wipe the mouth and hands while eating
Example
She placed a napkin on her lap before eating.
她在吃饭前把餐巾放在膝盖上。
A2 verb /səkˈsiːd/

succeed

成功
Meaning
to achieve the desired aim or result; to do well
Example
She worked hard to succeed in her career.
她努力工作，力图在事业中取得成功。
A2 verb /ˌɪntrəˈduːs/

introduce

介绍
Meaning
to present someone; to bring in for the first time
Example
Let me introduce you to my friend.
让我介绍你给我的朋友。
A2 adjective /ˌdʒæpəˈniːz/

japanese

日语
Meaning
relating to Japan, its people, or their language
Example
She loves Japanese culture and traditions.
她喜欢日本的文化和传统。
A2 noun /kæb/

cab

出租车
Meaning
a taxi or car for hire with a driver
Example
We took a cab to the airport.
我们坐出租车去了机场。
A2 verb /əˈpɪə/

appear

出现
Meaning
to become visible or come into sight; to seem
Example
She appeared suddenly at the door.
她突然出现在门口。
A2 noun /belt/

Belt

皮带
Meaning
a strip of leather or cloth worn around the waist to support clothes or for decoration
Example
He tightened his belt before going for a run.
他在跑步前系紧了皮带。
A2 noun rɪˈpɔːt

report

报告
Meaning
An account given of a particular matter, especially in the form of an official document after thorough investigation or consideration.
Example
The report highlights critical issues.
报告突出了关键问题。
A2 adjective /ˌwelˈnoʊn/

well-known

著名
Meaning
known by many people; famous or recognized
Example
He is a well-known actor in his country.
他是他国家的著名演员。
A2 noun /ˈsoʊldʒərz/

soldiers

Meaning
members of an army who serve their country in war or peace
Example
The soldiers marched proudly down the street.
A2 noun /ˈɪnfoʊ/

info

信息
Meaning
information; knowledge or facts about something or someone
Example
She gave me all the info I needed for the meeting.
她给了我所有会议所需的信息。
A2 noun /ˈbɑt.əm/

Bottom

底部；底层
Meaning
the lowest point or part of something; the ground under a body of water
Example
The treasure chest was lying at the bottom of the ocean.
宝箱躺在海洋的底部。
A2 verb (past tense / past participle) /əˈtræktɪd/

attracted

被吸引
Meaning
felt interest or liking toward someone or something; was drawn by appeal or force
Example
She was attracted to the idea of studying abroad.
她被出国留学的想法吸引了。
A2 adjective /ˈdeɪndʒərəs/

dangerous

危险
Meaning
likely to cause harm or injury; unsafe
Example
Driving fast on icy roads is dangerous.
在冰雪路面上开车很危险。
A2 noun /ɪˈkɒn.ə.mi/

economy

经济
Meaning
The wealth and resources of a country or region.
Example
A stable economy is essential for national growth.
稳定的经济对国家的增长至关重要。
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 /pərˈmɪʃən/

permission

许可
Meaning
the action of allowing or granting consent
Example
You need permission to enter the restricted area.
你需要许可才能进入限制区域。
A2 adjective /trəˈdɪʃənəl/

Traditional

传统的
Meaning
relating to or following long-established customs; conventional
Example
They had a traditional wedding ceremony.
他们举办了一个传统的婚礼仪式。
A2 noun /ˈɪntəvjuː/

interview

面试
Meaning
A meeting of people face to face, especially for consultation.
Example
The interview was conducted in a calm and professional manner.
面试以平静和专业的方式进行。
A2 noun səˈsaɪəti

society

社会
Meaning
The aggregate of people living together in a more or less ordered community.
Example
Society plays a pivotal role in shaping an individual's values.
社会在塑造个体价值观方面发挥着重要作用。
A2 noun /ˈɡʊdnəs/

goodness

善良
Meaning
the quality of being morally good or virtuous
Example
Her goodness was evident in the way she treated others.
她的善良在她对待他人的方式中表现得淋漓尽致。
A2 verb /ˈmɪsɪŋ/

missing

失踪
Meaning
Being without or lacking; failing to be present or included.
Example
Many youths are missing economic opportunities.
许多年轻人错失了经济机会。
A2 preposition /pɜːr/

per

每人
Meaning
for each, according to
Example
The tickets are priced at $20 per person.
票价为每人20美元。
A2 noun /prəˈdʌkʃən/

production

生产
Meaning
the process of manufacturing or creating something
Example
The production of this film took over a year.
这部电影的制作超过了一年。
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 noun, verb /ˈsɛntəns/

sentence

句子; 刑期
Meaning
A set of words that expresses a complete thought; or a punishment given by a court of law.
Example
The judge gave him a five-year prison sentence.
法官给了他五年监禁的刑期。
A2 noun /ˈθɪŋkɪŋ/

thinking

思考
Meaning
the process of considering or reasoning about something
Example
Her thinking was clear and precise.
她的思考清晰而准确。
A2 noun /ˈdraɪ.vər/

Driver

司机
Meaning
a person who operates a motor vehicle
Example
The taxi driver knew all the shortcuts through the busy city.
出租车司机知道通过繁忙城市的所有捷径。
A2 noun /spuːn/

Spoon

勺子
Meaning
an implement consisting of a small, shallow bowl on a long handle, used for eating, stirring, and serving food
Example
He used a spoon to eat his soup.
他用勺子吃汤。
A2 noun /ɪmˈpɔːtəns/

importance

重要性
Meaning
The quality or state of being important; consequence or significance.
Example
The importance of time management cannot be overstated.
时间管理的重要性无法被夸大。
A2 noun /læb/

lab

实验室
Meaning
a place equipped for scientific experiments, research, or teaching
Example
The students conducted an experiment in the chemistry lab.
学生们在化学实验室里做了一个实验。
A2 adjective /sɪksθ/

sixth

第六
Meaning
coming after the fifth in order, position, or rank
Example
He finished the race in sixth place.
他在比赛中获得了第六名。
A2 verb /tʃɪər/

cheer

欢呼
Meaning
to shout in encouragement or support; to make someone feel happier
Example
The fans cheered loudly when their team scored a goal.
当他们的队伍得分时，球迷大声欢呼。
A2 noun /ˌɪnvɪˈteɪʃən/

invitation

幸福
Meaning
a written or spoken request to attend an event or to participate in something
Example
She sent me an invitation to her wedding.
当她收到奖项时，她无法掩饰自己的幸福。
A2 noun /kɑːrˈtuːn/

cartoon

卡通片
Meaning
a humorous or animated drawing, especially one in newspapers or television
Example
Children love watching cartoons on TV.
孩子们喜欢看电视上的卡通片。
A2 adjective /ˈsʌðərn/

southern

南方的
Meaning
located in or facing the south; southern regions
Example
She moved to a southern city for work.
她为了工作搬到了一个南方城市。
A2 verb /daɪ/

die

死
Meaning
to stop living; to cease to exist
Example
The flowers will die without water.
花儿没有水就会死。
A2 noun ˈbæl.əns

balance

平衡
Meaning
A condition in which different elements are equal or in the correct proportions.
Example
Balance among powers prevents conflicts.
权力之间的平衡可以避免冲突。
A2 noun /niːs/

niece

侄女; 外甥女
Meaning
the daughter of one's brother or sister
Example
My niece is studying at the university this year.
我的侄女今年在大学学习。
A2 noun ˈkwɒl.ɪ.ti

quality

质量
Meaning
The standard of something as measured against other things of a similar kind; the degree of excellence of something.
Example
Quality assurance is vital in medical education.
质量保证在医学教育中至关重要。
A2 noun /ˈketʃ.ʌp/

Ketch-up

番茄酱
Meaning
a thick sauce made chiefly from tomatoes, vinegar, and spices
Example
She squeezed some ketchup on her french fries before eating them.
她在吃薯条前挤了一些番茄酱。
A2 adjective ˌɪn.təˈnæʃ.ən.əl

international

国际的
Meaning
Existing, occurring, or carried on between two or more nations and their citizens.
Example
International standards improve competitiveness.
国际标准提高竞争力。
A2 adjective /ɡreɪ/

Grey

灰色
Meaning
having a color between black and white
Example
The grey clouds indicated that rain was coming.
灰色的云表明雨水即将到来。
A2 noun /ˈdɒlfɪn/

Dolphin

海豚
Meaning
A highly intelligent marine mammal with a streamlined body and dorsal fin
Example
Dolphins are known for their playful behavior and intelligence.
海豚以其顽皮的行为和聪明而闻名。
A2 verb /tʃɑːrdʒ/

charge

收费/指控
Meaning
to demand payment; to formally accuse; to rush forward aggressively
Example
The store charges extra for home delivery.
商店收取额外的家居配送费用。
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 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 adjective /ˈsʌdən/

Sudden

突如其来的; 突然的; 出乎意料的;
Meaning
happening or done quickly and unexpectedly; abrupt
Example
There was a sudden change in the weather.
天气发生了突如其来的变化。
A2 noun /ˈfæʃ.ən/

fashion

时尚
Meaning
a popular or accepted style of clothing, behavior, or way of doing something
Example
She always keeps up with the latest fashion.
她总是跟上最新的时尚。
A2 noun/verb /ˈbætəl/

battle

战斗
Meaning
A fight between armed forces or a struggle to achieve or resist something.
Example
The soldiers prepared for the final battle.
士兵们为最后的战斗做好了准备。
A2 preposition /bɪˈsaɪd/

beside

在...旁边
Meaning
next to or at the side of someone or something
Example
She sat beside her best friend during the ceremony.
她在仪式期间坐在她最好的朋友旁边。
A2 verb /prəˈtɛkt/

protect

保护
Meaning
To keep safe from harm or injury.
Example
Protect yourself from the negative effects of social media.
保护自己免受社交媒体的负面影响。
A2 noun /keɪdʒ/

Cage

笼子
Meaning
a structure with bars or wire for keeping birds or animals
Example
The parrot lives in a large cage.
鹦鹉生活在一个大笼子里。
A2 noun /ˈɪndʒəri/

injury

伤害
Meaning
Harm or damage to a person’s body caused by an accident or attack.
Example
He suffered a serious injury during the football match.
他在足球比赛中受了重伤。
A2 noun /ˈsɪɡəˌrɛt/

cigarette

香烟
Meaning
a small roll of finely cut tobacco wrapped in paper for smoking
Example
He lit a cigarette after dinner.
他在晚餐后点燃了一支香烟。
A2 verb /ɪmˈpruːv/

improve

改善
Meaning
to make or become better; to enhance quality or condition
Example
Practice helps improve your skills.
练习帮助提高你的技能。
A2 adjective ˈnesəseri

necessary

必要
Meaning
Required to be done, achieved, or present; essential.
Example
Strict regulations are necessary for maintaining order.
严格的规定是必要的，以保持秩序。
A2 noun /ˈstʌmək/

Stomach

胃
Meaning
the organ in the body where food is digested; the belly or abdomen
Example
My stomach hurts after eating too much.
吃太多后我的胃痛。
A2 verb /kənˈtɪn.juːd/

continued

继续
Meaning
Kept happening or carried on without stopping.
Example
She continued working despite the challenges.
她继续工作，尽管面临挑战。
A2 adjective /laɪt red/

Light Red

浅红色
Meaning
a pale or diluted shade of red color
Example
She wore a light red dress to the party.
她穿着一件浅红色的裙子去参加派对。
A2 noun /ˈkʌpəl/

couple

一对
Meaning
two people or things considered together; a pair
Example
They make a lovely couple and have been married for five years.
他们是一个可爱的情侣，已经结婚五年了。
A2 adverb /dəˈrɛktli/ or /daɪˈrɛktli/

directly

直接
Meaning
in a straight line or manner; without anything in between
Example
She spoke directly to the manager about her concerns.
她直接与经理讨论了她的担忧。
A2 adjective /ˌjʊərəˈpiːən/

european

欧洲的
Meaning
Relating to Europe or its people.
Example
She studied European history at university.
她在大学学习了欧洲历史。
A2 noun /rɪˈzʌlt/

result

结果
Meaning
a consequence, effect, or outcome of something
Example
The result of the test was excellent.
测试的结果是优秀的。
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, verb /ˈriːzən/

reason

原因，理由
Meaning
A cause, explanation, or justification for an action or event; to think or argue logically.
Example
There is no reason to be upset.
没有理由生气。
A2 adjective /əˈveɪləbl/

available

可用的
Meaning
Able to be used, obtained, or accessed.
Example
The product is now available in all stores.
该产品现在在所有商店均可用。
A2 noun/adjective /ˈmɛksɪkən/

mexican

幸福
Meaning
a native or inhabitant of Mexico; relating to Mexico or its people, culture, or language
Example
She enjoys Mexican food like tacos and enchiladas.
她在获得奖项时无法隐藏自己的幸福。
A2 adjective /ˈkreɪzi/

Crazy

疯狂的; 极其愚蠢; 对某事狂热
Meaning
mentally ill; extremely foolish; wildly enthusiastic about something
Example
That's a crazy idea, but it might just work.
这是一个疯狂的想法，但它可能会奏效。
A2 verb /ˈsetəl/

settle

定居
Meaning
to resolve; to establish residence; to calm down
Example
They decided to settle in a quiet village.
他们决定在一个安静的村庄定居。
A2 noun /ˈɒbdʒɪkt/

object

物体
Meaning
a thing that can be seen and touched
Example
The table is an object in the room.
桌子是房间里的一个物体。
A2 noun /ədˈvaɪs/

advice

建议
Meaning
Guidance or recommendations offered with regard to prudent future action.
Example
Experts provide advice for better air quality.
专家提供建议，以改善空气质量。
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 /ɪkˈspɛnsɪv/

expensive

Meaning
costing a lot of money
Example
That car is too expensive for me to buy.
A2 verb /ˈædɪd/

added

添加
Meaning
to join something to something else to increase its size, number, or amount
Example
She added sugar to her coffee.
她在咖啡里加了糖。
A2 verb əˈnaʊnst

announced

宣布
Meaning
To make a public and typically formal declaration about a fact, occurrence, or intention.
Example
The mission was announced publicly.
任务已公开宣布。
A2 noun /ˌpɒsəˈbɪləti/

possibility

可能性
Meaning
something that may happen or be the case; a chance that something exists or might occur
Example
There is a strong possibility of rain tomorrow.
明天有强烈的降雨可能性。
A2 adjective /ˈpɜːrfɪkt/

Perfect

完美的; 无瑕疵的; 卓越的
Meaning
flawless; excellent; without fault
Example
She delivered a perfect performance on stage.
她在舞台上做出了完美的表现。
A2 noun /ˈkjuː.kʌm.bər/

Cucumber

黄瓜
Meaning
a long green vegetable with watery flesh, eaten raw in salads or cooked
Example
I added fresh cucumber slices to my salad.
我在沙拉里加入了新鲜的黄瓜片。
A2 noun /lʌk/

Luck

运气
Meaning
success or failure apparently brought by chance rather than through one's own actions
Example
She had good luck with her job interview.
她在面试中有好运气。
A2 noun /ˈwʌndər/

wonder

奇迹
Meaning
a feeling of amazement and admiration, caused by something beautiful, remarkable, or unfamiliar
Example
The view from the mountain was a true wonder.
从山顶看到的景色真是一个奇迹。
A2 verb /fraɪ/

fry

油炸
Meaning
to cook food in hot oil or fat
Example
She fries eggs for breakfast every morning.
她每天早晨煎蛋作为早餐。
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 noun /ˈmoʊ.tər ˌsaɪ.kəl/

Motor Cycle

摩托车
Meaning
a two-wheeled vehicle powered by an engine
Example
He rides his motorcycle to work every day.
他每天骑摩托车上班。
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。