| 词组 | back-up |
| 释义 | back-upadj.Supplementary; auxiliary; kept in need for safety. 后援的；补充的；辅助的；后备的，备用的。◆ When at war, it is essential to keep the lines open for back-up troops and supplies.战争期间，必须确保运输后援部队和军需品的线路畅通。◆ When the policeman saw what happened, he called in for back-up support.那位警察看到现场发生的情况后立即打电话要求增援。 |
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