| 单词 | red alert |
| 释义 | Word Frequency red alert(rɛd əˈlɜːt) noun if a hospital, a police force, or a military force is on red alert, they have been warned that there may be an emergency, so they can be ready to deal with it Sirens sounded an end to the red alert. All the Plymouth hospitals are on red alert. The country is on red alert. |
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