- 释义：
- adj. 机警的，警惕的
- 例句：
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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.
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The dog kept a vigilant guard over the house.
这只狗警醒地守护着这所房屋.
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Be vigilant against the danger of enemy agents infiltrating the government and boring from within.
要警惕敌特渗入政府内部进行暗中破坏.
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