- red alert应急状况；紧急警报，红色警报
- alertingn. 发信号 alert someone to sth 使...警觉；使...警惕
on the alert 提防；警戒著；随时准备著
red alert 紧急警报，红色警报；应急状况
- alert著；随时准备著
red alert 紧急警报，红色警报；应急状况
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3G,
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