tip:Do not keep a spare key over the door or under the door mat.
小贴士：不要在门上或者门垫下面留备用钥匙。
A dedicated spare drive temporarily takes over for a failed data drive.
专属备用磁盘临时接管发生故障的数据磁盘。
All his spare time has been devoted to learning English over the radio.
他所有的业余时间都花在通过收音机学习英语上了。
All his spare time has been devoted to learning English over the radio.
他所有的业余时间都花在通过收音机学习英语上了。
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