in the library 和at the library有区别吗?是：一个是在图书馆里工作另一个是在图书馆里看书吗?

in the library:
在图书馆里
例句与用法:
1.In the library,the books on history are all kept in one bay.
在图书馆里,历史方面的书都放在同一隔间里.
2.You can look for the book in the library catalog.
你可以在图书馆的图书目录上查找这本书.
3.I spent a very productive hour in the library.
我在图书馆里的这一小时收获很大.
4.You can look for the book in the library catalogue.
你可以在图书馆的图书目录上查找这本书.
5.He had spent several hours in the library poring over those musty documents.
他一连好几个小时呆在图书馆里仔细翻阅那些发霉味的文献资料.
6.I like to study in the library.
我喜欢在图书馆学习.
7.I ran across an old friend of mine in the library.
我在图书馆里与一位老朋友不期而遇.
8.I spent a very productivehour in the library.
我在图书馆里这一小时收获很大.
at the library:
在图书馆
例句与用法:
1.I'm just going to check in these books at the library.
我要去图书馆还这些书.
2.She changed her books at the library.
她把借的书还给图书馆,又借了几本.
你感觉一下,其斯文这个问题有点不好回答!

in the library 表示现在在图书馆里，这里可把图书馆看成建筑，人在建筑里
at the library 表示在图书馆那边，不一定在里面，可可能在外面，也就是旁边的意思！