| 词组 | back up |
| 释义 | back upv.1To move backwards. 向后移动；后退；倒退。◆ The train was backing up.火车正在向后移动。2To help or be ready to help; stay behind to help; agree with and speak in support of．帮助；支持；证实。◆ Jim has joined the Boy Scouts and his father is backing him up.吉姆参加了童子军，他的父亲很支持他。3To move behind (another fielder) in order to catch the ball if he misses it. 跑到（另一名外场手）背后策应。◆ The shortstop backed up the second baseman on the throw.球掷出时，游击手跑到二垒手背后策应。 |
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