knocked at和knocked on有什么区别?

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knocked at和knocked on有什么区别?
knocked at和knocked on有什么区别?

knocked at和knocked on有什么区别?
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Knock on:敲（门、窗等）
例句与用法:
1.He accidentally knocked on (the pass from Jones).他非故意犯规,用手向前击了（从琼斯传来的）球.
2.Jim sat up when he heard the knock on his bedroom door.吉姆听到敲寝室门的声音时便坐了起来.
3.Please do not enter before knocking on the door.进来前请先敲门.
Knock at:vt.敲例句与用法:
1.There was a furious knock at the door.有人在猛烈地敲门.
2.Did I hear a knock at the door?是有人敲门吗?
3.Did you hear the knocks at the door?你听到敲门声了吗
这两次词的区别不是很大,有时可以通用,但是一般表示敲在人身上的某个部位习惯用knock on 而不是knock at .如:Knock on her head 等.

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敲（门、窗等）这个意思是没区别
另外knock on还有
使碰撞：I knocked my head on the doorpost.我的头碰到了门柱上。
继续工作：Mother knocked on with the gardening for another hour.妈妈又在园子里干了一个小时。
【橄榄球】以手击球(犯规)：Don't try to knock the ball on, it's against the rules.
不要用手击球，这是犯规动作。
增加，提高：Inflation has greatly knocked on the prices.通货膨胀极大地提高了物价。

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