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on the alert phrase
⇨ watch watch noun watch ♦︎ guard ♦︎ vigil ♦︎ alertThese are all words for a situation when people are watching sb/sth in case sth bad happens. 这些词均表示注视、监视。PATTERNS AND COLLOCATIONS 句型和搭配◆on watch / guard / alert◆a close watch / guard◆a round-the-clock watch / guard / vigil◆to keep watch / guard / a vigil◆to mount a watch / (a) guard■ watch [singular, uncountable] the act of watching sb/sth carefully in case of possible danger or problems 注意；注视；监视◆The government is keeping a close watch on how the situation develops.政府正密切注视事态的发展。◆Go in and see if you can find it in his study. I'll keep watch for you (= watch and warn you if sb is coming).进去看看在他书房里能不能找到，我给你放哨。 see also watch ⇨ monitor verb ■ guard [uncountable] the act or duty of protecting property, places or people from attack or danger; the act or duty of preventing prisoners from escaping 警戒；保卫；看守◆Two sentries stood on guard (= at their post, on duty).有两个哨兵站岗。◆The escaped prisoner was brought back under armed guard.越狱的囚犯由武装警卫押回。 see also guard ⇨ guard noun , guard ⇨ protect verb ■ vigil / /ˈvɪdʒɪl/ / [uncountable] the act of staying awake for a long time, especially at night, in order to watch a sick person, say prayers or protest against sth （照顾病人、祈祷或抗议的）值夜；守夜祈祷◆His parents kept a round-the-clock vigil at his bedside.他的父母日夜守护在他床边。◆Students held a candlelit vigil against the war.学生们举行了烛光守夜祈祷活动反对战争。■ alert /əˈlɜːt; NAmE əˈlɜːrt/ [uncountable, singular] a situation in which people are watching for danger or an emergency and ready to deal with it 警戒；警备；警惕◆Police are warning the public to be on the alert for suspicious packages.警方警告公众要提防可疑包裹。◆More than 5 000 troops have been placed on full alert.5 000多名士兵已处于全面戒备状态。◆Following the bomb blast, local hospitals have been put on red alert.爆炸发生之后，当地医院已处于红色警备状态。 see also alert ⇨ warning noun , alert ⇨ warn verb , alert to sth ⇨ aware |