backup支援
来自Counter-strike在CS无线电用语中，有一句是用来呼唤队友支援的need backup。backup是支援、后援之意，在电脑上又有备份的意思，而在比赛中又可以表示替补、后备队员，可以说是一个很有用的单词哦。
backup n.支持，后援;阻塞
例句：Heres our backup .
这是我们的后援。
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