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(on the)alert;be alerted
guard;take precautions;be on the alert处于～状态be on the alert;be in a state of readiness/～森严be heavily guarded;enforce tight security
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。