在自行车上用on还是in

on的例句

There is a light on the desk．

桌子上有盏台灯。

He laid a hand on my shoulder.

他把一只手放在我肩上。

There is a picture on the wall.

墙上有一幅画。

She stood on my left.

她站在我左边。

He jumped with joy on hearing the news.

他一听到这个消息就高兴得跳了起来。

The teacher made comments on our compositions.

老师就我们的作文作了讲评。

They said they were acting on instructions.

他们说他们是奉命行事。