| 单词 | yellow alert |
| 释义 | yellow alert in American Englishnoun 1. (in military or civilian defense) the first alert given when enemy aircraft are discovered approaching a military installation, city, coastline, etc Compare blue alert, red alert, white alert2. the signal or alarm sounded for this alert 3. any primary stage of alert, as when toxic chemicals have escaped in a particular area and a potential hazard exists Word origin [1965–70] |
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