- abbr.(=astatine)【化】(=Air Transport)
- 网络自动变速箱(Automatic Transmission)；奥地利(Austria)；砹
在（某处）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?
在（表示学习或工作地点）used to say where sb works or studies
He's been at the bank longer than anyone else.
She's at Yale(= Yale University) .
在（某时间或时刻）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.
What are you doing at the weekend?
在…岁时used to state the age at which sb does sth
She got married at 25.
她 25 岁结婚。
He left school at the age of 16.
他 16 岁中学毕业。
向；朝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.
（用于动词后，涉及未做成或未做完的事）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) .
在…远；从相隔…远的地方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?
处于…状态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.
（用于速度、比率等）以，达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) .
Prices start at $1 000.
起价 1 000 元。
~ sb's/sth's best/worst, etc.
处于最佳（或最差等）状态；在全盛（或谷底等）时期used to say that sb/sth is as good, bad, etc. as they can be
This was Murray at his best.
The garden's at its most beautiful in June.
（与形容词连用，表示能力）在…方面used with adjectives to show how well sb does sth
I'm good at French.
She's hopeless at managing people.
（与形容词连用）因为，由于，对…used with adjectives to show the cause of sth
They were impatient at the delay.
She was delighted at the result.
应…（而）；响应；回答in response to sth
They attended the dinner at the chairman's invitation.
（提供电话号码时用）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。
（用于电子邮箱地址中的符号 @）the symbol ( @ ) used in email addresses