英语词汇之介词at的八种用法：
1、在...时刻
Toby usually gets up at 6 o'clock.
At the age of seventy,the old man died.
2、在...地点、场合
He is standing at the door.
I will meet he at the station.
另外：at chrismans/on chrismans day
3、面对、朝
Don't throw a stone at pet.
4、价格、速度、数量
The car gots at 80 kilometers an hour.
They sell the product at 40 RMB.
5、处于某种状态，进行某种活动(at+名词）
I'm working.= I'm at work.
Is the manager at the meeting?
6、1)在...方面有特长 (be good at + sth)
What are you good at?
I'm good at English/shopping.
2)在...吃惊
I'm surprise at your behaviour.
7、原因
At the news, they are sad.= Bacause of the news,they are sad.
8、应...要求
He attend the party at the invitation of toby.
He agrees to come at the invitation of mine.
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