已还原数据库 '%2' 的文件 '%1' 保留为无效状态，因为该数据库使用的是简单恢复模式，而且该文件被标记为要进行读写访问。因此，只有只读文件才能通过逐段还原进行恢复。

The file '%1' of restored database '%2' is being left in the defunct state because the database is using the simple recovery model and the file is marked for read-write access. Therefore, only read-only files can be recovered by piecemeal restore.