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used to say where something/somebody is or where something happens 在（某处） at the corner of the street 在街角 We changed at Crewe. 我们在克鲁换的车。 They arrived late at the airport. 他们晚到了机场。 At the roundabout take the third exit. 在环岛处走第三个出口。 I'll be at home all morning. 我一上午都在家。 She's at Tom's (= at Tom's house). 她在汤姆家中。 I met her at the hospital. 我在医院遇见了她。 How many people were there at the concert? 音乐会上有多少人？
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used to say where somebody works or studies 在（表示学习或工作地点） He's been at the bank longer than anyone else. 他在银行工作的时间比任何人都长。 She's at Yale (= Yale University). 她在耶鲁大学。
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used to say when something happens 在（某时间或时刻） -
used to state the age at which somebody does something 在…岁时 -
in the direction of or towards somebody/something 向；朝 used after a verb to show that somebody tries to do something, or partly does something, but does not succeed or complete it （用于动词后，涉及未做成或未做完的事） -
used with adjectives to show how well somebody does something （与形容词连用，表示能力）在…方面 -
used to show a rate, speed, etc. （用于速度、比率等）以，达 -
used to state the distance away from something 在…远；从相隔…远的地方 -
used to show the situation somebody/something is in, what somebody is doing or what is happening 处于…状态 - at somebody’s/something’s best/worst, etc.
used to say that somebody/something is as good, bad, etc. as they can be 处于最佳（或最差等）状态；在全盛（或谷底等）时期 -
used with adjectives to show the cause of something （与形容词连用）因为，由于，对… - (formal)
in response to something 应…（而）；响应；回答 - (North American English)
used when giving a phone number （提供电话号码时用） - (
computing 计算机 the symbol (@) used in email addresses （用于电子邮箱地址中的符号 @）
Word OriginOld English æt, of Germanic origin; related to Old Frisian et and Old Norse at, from an Indo-European root shared by Latin ad ‘to’.
Idioms
at that
be at it again
where it’s at