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Someone who is vigilant gives careful attention to a particular problem or situation and concentrates on noticing any danger or trouble that there might be.
alert
He warned the public to be vigilant and report anything suspicious.
他告诫公众要提高警惕，遇到任何可疑情况都要报告。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。