When I rotate A mesh, B mesh will rotate too, but I don't want it, how can i do? I made 2 mesh（cylinder.001 &amp; cylinder.000, separate mesh）, the inside mesh is made by duplicating the outside mesh. After that , when i rotate one of the 2 meshes ,the other one will rotate too. I don't know why? how can I cancel the link between two meshes? 

Hope someone can help me to solve this problem ,thanks
You have to disable the Proportional Editing option