abbr. 气温(=air temperature)
at 义务阶段1500 全国卷频次:1117
It wasn’t easy at the beginning.
Owner Iain Powell said he had had cats at the gallery for 15 years.
Young children have to learn Chinese pinyin at school.
Equipment is included except walking shoes, which can be hired at a low cost.
at all （否定句）根本；究竟
be in at 在场，参与;参与；与…有关;[口语] (在某事的最后阶段)在场；参与：;
at it again [口语]争吵；重复负面消极的行为(此语亦可含有与性行为有关的意思)
[表示價格,速度等]以,達;在..方面It drives at about 100 kilometers an hour.它以每小時100公裏的速度行駛.
1. used to say where sth / sb is or where sth happens
at the corner of the street
We changed at Crewe.
They arrived late at the airport.
At the roundabout take the third exit.
I’ll be at home all morning.
She’s at Tom’s (= at Tom’s house).
I met her at the hospital.
How many people were there at the concert?
2. used to say where sb works or studies
He’s been at the bank longer than anyone else.
She’s at Yale (= Yale University).
3. used to say when sth happens
We left at 2 o’clock.
at the end of the week
We woke at dawn.
I didn’t know at the time of writing (= when I wrote).
At night you can see the stars.
(BrE) What are you doing at the weekend?
4. used to state the age at which sb does sth
She got married at 25.
她 25 岁结的婚。
He left school at the age of 16.
他 16 岁便离开学校。
5. in the direction of or towards sb / sth
What are you looking at?
He pointed a gun at her.
Somebody threw paint at the prime minister.
6. used after a verb to show that sb tries to do sth, or partly does sth, but does not succeed or complete it
He clutched wildly at the rope as he fell.
She nibbled at a sandwich (= ate only small bits of it).
7. used to state the distance away from sth
I held it at arm’s length.
Can you read a car number plate at fifty metres?
8. used to show the situation sb / sth is in, what sb is doing or what is happening
The country is now at war.
I felt at a disadvantage.
I think Mr Harris is at lunch.
9. used to show a rate, speed, etc.
He was driving at 70 mph.
他以每小时 70 英里的速度驾车行驶。
The noise came at two-minute intervals (= once every two minutes).
10. ~ sb’s / sth’s best / worst, etc. used to say that sb / sth is as good, bad, etc. as they can be
This was Henman at his best.
The garden’s at its most beautiful in June.
11. used with adjectives to show how well sb does sth
I’m good at French.
She’s hopeless at managing people.
12. used with adjectives to show the cause of sth
They were impatient at the delay.
She was delighted at the result.
13. (formal) in response to sth
They attended the dinner at the chairman’s invitation.
14. (NAmE) used when giving a telephone number
You can reach me at 637-2335, extension 354.
你可以打 637-2335 这个电话号码,转分机 354,与我联系。
15. (computing 计) the symbol (@) used in email addresses
▪ at that
used when you are giving an extra piece of information
He managed to buy a car after all—and a nice one at that.
▪ be ‘at it again
to be doing sth, especially sth bad
Look at all that graffiti—those kids have been at it again.
▪ 7where it’s ‘at (informal) a place or an activity that is very popular or fashionable
Judging by the crowds waiting to get in, this seems to be where it’s at.
1 used to say exactly where something or someone is, or where something happens 在；在…里；在…上〔指地点〕
They live at 18 Victoria Street.
Does this train stop at Preston?
I was waiting at the bus stop.
Liz and her friend sat down at a corner table.
Turn left at the church.
We’ll meet at Harry’s (=at Harry’s house).
I spent an unpleasant hour at the dentist’s.
Dad’s at work (=in the place where he works).
at the top/bottom/end etc (of something)
At the top of the stairs, she paused.
2 used to say what event or activity someone is taking part in 在〔做某事的时候〕
I met my wife at a disco.
The matter was discussed at a meeting of the finance committee.
I’m sorry, Pam’s at lunch just now.
3 used to say that someone is studying somewhere regularly 在〔上学〕
Is Jessica still at school?
Hulme was a student at Oxford in the 1960s.
4 used to say exactly when something happens 在…时刻〔表示某事发生的确切时间〕
The film starts at 8 o’clock.
5 during a particular period of time 在…期间
My husband often works at night.
We go to Midnight Mass at Christmas.
6 used to say which thing or person an action is directed towards or intended for 向，朝
He gazed up at the sky.
You don’t have to shout at me.
The older girls used to throw stones at me.
The course is aimed at those aged 16 or over.
7 used to say what or who causes an action or feeling 因为，由于
The children all laughed at his jokes.
I’m surprised at you!
Dad got really mad at me for scratching the car.
her distress at having to leave
8 used to say which subject or activity you are talking about when you say whether someone is skilful, successful etc or not 在…方面
9 used to say that someone or something is in a particular state 处于〔某种情况或状态〕
10 used to show a price, rate, level, age, speed etc 以；在〔表示价格、比率、水平、年龄、速度等〕
11 at your best/worst/most effective etc used to say that, at a particular time, someone or something is as good, bad etc as they can be 处于最佳/最差/最有效等的状态
12 used to say what someone tries to touch, or keeps touching 〔表示试图触及或不放开〕
13 used to say what someone tries to do 从事于
14 because of what someone has said 应，响应，由于〔某人的话〕
15 while I’m/you’re etc at it spoken used to suggest that someone should do something while they are doing something else 趁我/你等在做某事的时候顺便〔用于建议别人做某事〕
16 be at it again informal if you say that someone is at it again, you mean that they are doing something you disapprove of, which they have done before 又来了〔表示某人又在做你不喜欢的事〕
17 at that
18. be where it’s at old-fashioned informal used to say that a place or activity is very popular, exciting, and fashionable 是流行[精彩，时尚]的场所[活动]→ at all at all1(6)
USAGE: At, in, on
Origin at Old English æt
In addition to the uses shown below, at is used after some verbs, nouns, and adjectives to introduce extra information. At is also used in phrasal verbs such as ‘keep on at’ and ‘play at’.
除下列用法外，at用于某些动词、名词、形容词后以引出附加信息。at还可用于keep on at, play at等短语动词中。
1.PREP 介词在（某地）；在（某场合） You use at to indicate the place or event where something happens or is situated.
We had dinner at a restaurant in Attleborough…
He will be at the airport to meet her…
I didn’t like being alone at home…
Hamstrings are supporting muscles at the back of the thigh…
The announcement was made at a news conference.
2.PREP 介词在（上学） If someone is at school or college, or at a particular school or college, they go there regularly to study.
He was shy and nervous as a boy, and unhappy at school…
It was at university that he first encountered Hopkins…
I majored in psychology at Hunter College.
3.PREP 介词在…旁边；靠近 If you are at something such as a table, a door, or someone’s side, you are next to it or them.
An assistant sat typing away at a table beside him…
Graham was already at the door…
At his side was a beautiful young woman…
He gave the girl at the desk the message.
4.PREP 介词从相隔（一段距离）的地方;呈…角度 When you are describing where someone or something is, you can say that they are at a certain distance. You can also say that one thing is at an angle in relation to another thing.
The two journalists followed at a discreet distance…
The tree was leaning at a low angle from the ground.
5.PREP 介词在（某时间或时刻） If something happens at a particular time, that is the time when it happens or begins to happen.
The funeral will be carried out this afternoon at 3.00…
He only sees her at Christmas and Easter.
6.PREP 介词在（某一年龄时）；在…岁时 If you do something at a particular age, you do it when you are that age.
Blake emigrated to Australia with his family at 13…
Mary Martin has died at her home in California at the age of seventy-six.
7.PREP 介词以，达（某一速度、频率、水平或价格） You use at to express a rate, frequency, level, or price.
I drove back down the highway at normal speed…
Check the oil at regular intervals, and have the car serviced regularly…
The submarine lies at a depth of 6,000 feet in the Barents Sea.
…custom-designed rugs at $16 to $100 a sq ft.
8.PREP 介词以，达（某一数量） You use at before a number or amount to indicate a measurement.
Weighing in at eighty tons, the B-19 was easily the largest and most sophisticated warplane in the world.
…as unemployment stays pegged at three million.
9.PREP 介词朝（某人或某物看）；向（某人掷物）；冲（某人说话） If you look at someone or something, you look towards them. If you direct an object or a comment at someone, you direct it towards them.
He looked at Michael and laughed…
The crowds became violent and threw petrol bombs at the police…
A couple of people started shouting abuse at them as they walked past a pub.
10.PREP 介词向，朝（某人微笑、招手等） You can use at after verbs such as ‘smile’ or ‘wave’ and before nouns referring to people to indicate that you have put on an expression or made a gesture which someone is meant to see or understand.
【搭配模式】：v PREP n
She opened the door and stood there, frowning at me…
We waved at the staff to try to get the bill.
11.PREP 介词（指）向… If you point or gesture at something, you move your arm or head in its direction so that it will be noticed by someone you are with.
【搭配模式】：v PREP n
He pointed at the empty bottle and the waitress quickly replaced it…
He gestured at the shelves. ‘I’ve bought many books from him.’
12.PREP 介词致力于;定位于;期望达到 If you are working at something, you are dealing with it. If you are aiming at something, you are trying to achieve it.
She has worked hard at her marriage.
…a $1.04m grant aimed at improving student performance on placement examinations.
13.PREP 介词应（某人邀请或要求） If something is done at someone’s invitation or request, it is done as a result of it.
【搭配模式】：PREP n with poss
She left the light on in the bathroom at his request…
I visited Japan in 1987 at the invitation of the Foreign Minister.
14.PREP 介词处在…状态 You use at to say that someone or something is in a particular state or condition.
【搭配模式】：v-link PREP n
I am afraid we are not at liberty to disclose that information…
Their countries had been at war for nearly six weeks.
15.PREP 介词（用于所有格代词和形容词最高级前，表示某人或某物在此时的某一特征最鲜明） You use at before a possessive pronoun and a superlative adjective to say that someone or something has more of a particular quality than at any other time.
【搭配模式】：PREP poss adj-superl
He was at his happiest whilst playing cricket…
Howards End is old fashioned film-making at its best.
16.PREP 介词以…方式 You use at to say how something is being done.
Three people were killed by shots fired at random from a minibus…
Mr Martin was taken out of his car at gunpoint.
17.PREP 介词（表示某人重复做某事） You use at to show that someone is doing something repeatedly.
【搭配模式】：v PREP n
She lowered the handkerchief which she had kept dabbing at her eyes…
Miss Melville took a cookie and nibbled at it.
18.PREP 介词在…方面（擅长） You use at to indicate an activity or task when saying how well someone does it.
【搭配模式】：adj PREP n
I’m good at my work…
Robin is an expert at cheesemaking…
She excels at sport.
19.PREP 介词对…的反应 You use at to indicate what someone is reacting to.
【搭配模式】：adj PREP n
Eleanor was annoyed at having had to wait so long for him…
The British team did not disguise their delight at their success…
Six months ago she would have laughed at the idea.
20. at all→see: all;
at /ˈæt/ /ət/ preposition
— used to indicate the place where someone or something is在…里；在（某处）
We’re staying at a hotel.
The kitchen is at the back of the house.
He was sitting at the table.
They left for Cambridge early and arrived at [=in] Cambridge before noon.
The party will be at Susan’s house. = The party will be at Susan’s.
Ann works at [=in] a library.
We met at a party.
They live at opposite ends of town.
They met at [=on] a street corner in a town.
“Is your father at home?” [=is your father home?] “No, he’s working late at the office.”
She met us at the door.
He was standing at [=next to] the window.
There were 200 people at the wedding. [=200 people attended the wedding] 有200人参加了婚礼。
Their older son has graduated, but their younger son is still at school. [=is still attending school] 他们的大儿子毕业了，但小儿子还在上学。
Who was at the controls when the accident occurred?
— used to indicate the person or thing toward which an action, motion, or feeling is directed or aimed向；朝；以…为目标
She pointed her gun at the target.
He’s angry at his brother.
His anger is directed at his brother.
She shouted (words of) abuse at me.
He looked directly at me.
They laughed at him.
She grabbed at my arm. [=she tried to grab my arm] 她想要抓住我的胳膊。
He poked at his food.
— used to indicate something that is being tried or attempted从事；忙于
I made an attempt at persuading him to go.
I took a shot at doing it myself. [=I tried to do it myself] 我尝试自己去做这件事。
: because of or in reaction to (something)因为；由于；对…回应
They laughed at my joke.
She’s furious at how slowly the investigation is proceeding.
— used to indicate the cause of an action, feeling, etc.用于指引起某种举动、情感等的原因
I was greatly surprised at [=by] the result. [=the result surprised me greatly] 这个结果让我大吃一惊。
He enlisted in the army at his father’s urging. [=because his father urged him to] 由于父亲的主张，他加入了陆军。
She visited the museum at my suggestion.
They came here at our invitation.
You can act at your own discretion.
— used to indicate an activity处于…活动
He’s very serious when he’s at work. [=when he’s working] 他工作时很严肃。
children who are at play [=children who are playing] 正在玩耍的孩子们
She’s good at (playing) chess. [=she plays chess well] 她擅长下国际象棋。
I’m bad at cooking. [=I’m a bad cook, I do not cook well] 我不擅长烹饪。
She’s doing very well at her studies.
— used to indicate a situation or condition处于…状态
I’m not at liberty to discuss that.
two nations that are at war
people who are at risk
He is now at peace.
a — used to indicate position on a scale or in a series达（表数值）
The temperature is at 90 degrees.
He was driving at almost 80 miles an hour.
b — used to indicate a rate以（表价格）
They sell at [=for] a dollar a dozen. [=each dozen costs one dollar] 他们卖一美元一打。
— used to indicate an age or time在…岁时；在…时间
He plans to retire at (age) 65.
He called us at (about/exactly) 9 o’clock on July 24.
I still think of her at certain moments/times.
He was president of the company at (the time of) his death.
— used to indicate the method by which something is done通过；经由
The property was sold at auction.
a — used in phrases like at best, at worst, etc., to indicate a possible result or condition that is considered best, worst, etc.最好的，最糟的（用于at best、at worst等短语）
The company will make a small profit at best this year. [=it is not possible that the company will earn anything better/more than a small profit] 公司今年顶多是微赢利。
We might be 5 or 10 minutes late at worst. [=we will not be more than 5 or 10 minutes late] 我们可能最多也就是迟到5或10分钟。
We should arrive by noon at the latest. [=we should not arrive later than noon] 我们最迟应该在中午到。
b — used in phrases like at its best, at its worst, etc., to indicate that something or someone is as good, bad, etc., as possible处于最佳（或最差）的状态（用于at its best、at its worst等短语）
This is baseball at its best.
He’s often rude, and last night he was at his worst.
◊ The word at is used in speech in e-mail addresses.单词at用于口述电子邮件地址时。
“Can I e-mail you?” “Sure. Our e-mail address is ‘comments at Merriam-Webster dot com.’”
“我可以给你们发电子邮件吗？”“当然可以。我们的电子邮箱地址是comments at Merriam-Webster dot com。”
In writing, the symbol @ is used instead.在书面语中，用符号@代替。
: doing some activity做某事
I didn’t expect her to have started working yet, but she was already (hard) at it when I arrived. [=she was already working (hard) when I arrived] 我本来没指望她开始工作，但我到的时候她已经在（努力）干活了。
My neighbors are always arguing, and they were at it again last night. [=they were arguing again last night] 我的邻居总是吵架，昨晚他们又吵起来了。
Since we’re cleaning the kitchen, we should wash the floor while we’re at it. [=we should wash the floor when we clean the kitchen] 既然要打扫厨房，我们应该同时把地板也擦了。
“I’m going to the store to buy a newspaper.” “While you’re at it, could you get some milk?”
— see 1that
where it’s at
— see 1where
where (someone) is at
— see 1where