vt.
敲，击，打；撞：
to knock somebody on the head
打某人的头
to knock a ball out of the field
把球击出场地
使碰撞：
He knocked his head against the wall.
他的头撞到了墙上。
敲掉，打掉；拆掉；拍去：
She knocks the dust out of her coat.
她打掉外套上的尘土。
They are knocking the wall down.
他们正在拆掉那堵墙。
敲成，敲出：
t