| 单词 | to be on the alert for |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔WATCH〕Staff have been warned to be on the alert for bombs. 已提醒员工要警惕炸弹。朗文写作活用〔alertness〕They want to be on the alert for similar buying opportunities.他们希望随时掌握有关类似购买机会的信息。柯林斯高阶〔alert〕Police are warning the public to be on the alert for suspicious packages.警方警告公众要警惕可疑包裹。牛津高阶〔alert〕The public were warned to be on the alert for (= watching carefully for) suspicious packages.有关部门提醒公众，要警惕可疑包裹。剑桥高阶〔alert〕They want to be on the alert for similar buying opportunities.他们希望及时关注到类似的购买机会。外研社新世纪 |
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