late 15c., from Middle French vigilant or directly from Latin vigilantem (nominative vigilans) "watchful, anxious, careful," present participle of vigilare "to watch, keep awake, not to sleep, be watchful," from vigil "watchful, awake" (see vigil). Related: Vigilantly.
实用例句
1. He warned the public to be vigilant and report anything suspicious.
他警告公众要提高警惕，遇到任何可疑情况都要报告。
来自柯林斯例句
2. A pilot must remain vigilant at all times.
飞行员必须随时保持警惕。
来自《权威词典》
3. He has to learn how to remain vigilant through these long nights.
他得学会如何在这漫长的黑夜里保持警觉.
来自《简明英汉词典》
4. The dog kept a vigilant guard over the house.
这只狗警醒地守护着这所房屋.
来自《现代英汉综合大词典》
5. All but one of these letter bombs had been intercepted by vigilant post office staff.
