警戒着, 随时准备着, 密切注意着;

Police are warning the public to be on the alert for suspicious packages.
警方警告公众要警惕可疑包裹。
来源:《牛津高阶英汉双解词典》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》The armed forces were on high alert to guard against any retaliation.
武装部队保持高度戒备,以防发生任何报复行动。
来源:《柯林斯高阶英汉双解学习词典》Following the bomb blast, local hospitals have been put on red alert.
炸弹爆炸之后,当地医院一直处于戒备状态。
来源:《牛津高阶英汉双解词典》Following the bomb blast, local hospitals have been put on red alert .
炸弹爆炸之后,当地医院一直处于戒备状态。
来源:《牛津高阶英汉双解词典》纳米英语 · 双语娱乐资讯

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