warn;warning admonish;[军]be on the alert against;guard against;alertness ;

Armed soldiers guard the streets in this volatile atmosphere.
目前局势动荡不定,有武装士兵在街道上警戒。
来源:《柯林斯高阶英汉双解学习词典》Are you all watching out? The Queen will come this way in a few minutes!
你们都注意警戒了 吗 ?过几分钟女王就要从这条路通过了!
来源:《简明英汉词典》Each corner had a guard tower, each of which was exactly ten meters in height.
每个角落都有一座警戒塔,每座警戒塔正好10米高。
来源:《柯林斯高阶英汉双解学习词典》To make extra certain, a police helicopter kept watch from the skies.
为确保万无一失,一架警用直升机一直在空中警戒。
来源:《柯林斯高阶英汉双解学习词典》The Armies were constantly on the alert not to be taken by surprise.
部队一直处于警戒状态以防突然袭击.
来源:《现代汉英综合大词典》
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