backup .名詞 n.

1.幫助；援助；支持 military backup 軍事援助

2.替代物;備用品;支援人員, 后備, 后補, 助手 a backup singer for Stevie Wonder 史蒂維·旺德的伴唱歌手 The hospital has a backup generator in case there is a power failure. 醫(yī)院有備用發(fā)電機以防停電。 She once sang backup for Madonna. 她曾經(jīng)為麥當娜伴唱。

3.(流水受阻造成的)阻塞；泛濫；(車輛等)擁塞

4.備份文件 a backup disk 備份磁盤 Have you kept a backup of this file? 你把這文件備份了嗎? We had no computer backup and had to rely on old paper files to reconstruct the records. 我們沒有計算機備份,只得靠落后的紙檔案重做記錄。