短语词组短語Backing Storage Device 儲存設備backing off device 後退裝置backing up device 備份設備floating head backing device 浮頭鉤圈;浮頭勾圈;繙譯backing device info 使用爲每個塊設備S -floating head with backing device 鉤圈式浮頭 返回 backing device