mary was so tired that she fell asleep over her book 为什么用over

题目

mary was so tired that she fell asleep over her book 为什么用over

答案

用over,和用on不同
这表明,他虽然在书上睡着了,但是,不是拔在书上,而是和书有距离,在书的上方
具体是个什么睡姿,可以想象成书在他的膝盖上