The dog rubbed its back ____ the wall.

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The dog rubbed its back ____ the wall.

The dog rubbed its back ____ the wall.
The dog rubbed its back ____ the wall.

The dog rubbed its back ____ the wall.
against,这句话的意思是这条狗的背在墙上蹭来蹭去.against有紧靠;倚;碰撞的意思.牛津字典上的原句是the cat rubbed itself against my legs,猫在我腿上蹭来蹭去.

against
rub against 摩擦
小狗用它的背在墙上磨蹭

on 这只狗在墙上擦它的背

against
作为介词用法如下
In a direction or course opposite to:
逆:与某个方向或过程相反:
row against the current.
逆水行舟
可以理解为有反作用力的过程