-f, --force force unmount (in case of an unreachable NFS system)
-l, --lazy detach the filesystem now, and cleanup all later
-l 这么牛?现在分离文件系统,稍后再进行清理
-f, --force force unmount (in case of an unreachable NFS system)
-l, --lazy detach the filesystem now, and cleanup all later
-l 这么牛?现在分离文件系统,稍后再进行清理