他把箱子靠在墙上，然后坐在上面。

He set the cases against a wall and sat on them.

《柯林斯英汉双解大词典》

我跟着女主人走到桌旁，等她把椅子拉出来，我便坐在上面，十分自然，因为这正是我想坐的椅子。

I followed the hostess to the table, and when she pulled the chair out I sat on it, quite naturally, since it happened to be the chair I wanted to sit in.

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爬楼梯的时候，他们可以坐在上面休息。

They can sit on it and rest when they're climbing stairs.

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