he is reading in the library.还是he is reading at the library啊?

问题描述:

he is reading in the library.还是he is reading at the library啊?
两者都行的话,有什么区别啊?

in的范围更明确,就是在图书馆里
at是大范围,更泛泛一点,也可能是坐在图书馆门口看书