The band was miming to a backing tape.

乐队跟着伴奏带在模拟演唱。

《牛津词典》

If you are backing up to a tape drive (as specified in the Destination section of the General page), the Unload the tape after backup option is active.

如果备份到磁带机(如同“常规”页的“目标”部分指定的一样)，则“备份后卸载磁带”选项处于活动状态。

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A tape changer is not required when backing up to a hard disk.

在备份到硬盘时不需要磁带更换人。

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When writers joined they were given a tape recorder for phone calls, to give them crucial backing when they were hauled into court.

ECONOMIST: Jim Michaels