guard;take precautions;be on the alert;keep a sharp lookout;watch out for ;

Warnings of an enemy attack forced the troops onto the defensive.
敌军显示出进攻的迹象,部队不得不进入戒备状态.
来源:《简明英汉词典》The escaped prisoner was brought back under ( close ) guard , ie ( closely ) guarded.
在严密的 戒备 下将逃犯押回.
来源:词典精选例句Due to a security alert, this train will not be stopping at Oxford Circus.
由于安全戒备的原因,该次列车在“牛津街口广场”站将不停留。
来源:《柯林斯高阶英汉双解学习词典》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》I recommended that Schlesinger stand down the alert starting at midnight.
我建议施莱辛格暂时停止昨天午夜开始的戒备措施.
来源:词典精选例句Knowing that danger threatened the sentry kept an extra careful watch.
由于知道随时都有可能发生危险,那个哨兵格外加强了戒备.
来源:词典精选例句
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