错误信息非常明确：您的数据库正在使用中。执行还原时，必须关闭与数据库的所有连接。不只是您当前的应用程序 - 但是所有PC上的每个访问数据库的应用程序都必须关闭。

The error message is pretty explicit: your database is in use. You have to close all connections to the DB while you do the restore. Not just your current app - but every application that is accessing the database has to be shut down, on all PCs.