in the library还是at the library?

in the library还是at the library? at the library与in the library he is reading in the library.还是he is reading at the library啊 at the library 跟in the library有区别吗? at the library和in the library有什么区别? 是rules for library还是rules in the library? we____talk in the library in、on、at什么时候加the?比如为什么in the library,不是in library Look at the map in the library哪错了 at the library 和in the library 有什么区别?什么时候用前者?什么时候用后者? at the library和in the library两种都可以用吗? 急,十万火急 at the library at the mall at school at the pool 和 in the li