n.守夜,熬夜,节日(斋戒)前夜的守夜,警戒,监视,不眠
Drugs are a problem that requires constant vigilance.
需要对毒品问题长期保持警惕。
Never relax your vigilance while you live in peace.
你们要居安思危.
The birds cannot afford to relax their vigilance against predators.
鸟儿不敢放松对捕食者的警戒.