backup
[ˈbækˌʌp]
n.
支持，后援;
阻塞;
备份文件;
[乐]伴奏;
adj.
备用的，后补的;
支持性的;
伴奏的;
例句:
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She once sang backup for Madonna.
她曾经为麦当娜伴唱.
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Every part of the system has a backup.
系统的每个部分都有备用元件。
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The police had backup from the army.
警方得到了军方的增援。
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Only now even his backup position is not secure.
来自WSJ
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Backup catcher Kyle Skipworth was sent as a messenger.
来自WSJ
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Inc., which sells online data-backup services to businesses.
来自WSJ