seal off
phrasal verbseal something off
(of the police, army 警察、军队 to prevent people from entering a particular area 封锁；封闭 Troops sealed off the site following a bomb alert. 炸弹警报发出后，部队封锁了现场。 The road will remain sealed off until the police have completed their investigations. 在警方完成调查之前，道路将保持封闭。
Extra ExamplesPolice sealed off the area. 警察封锁了该地区。 The nuclear plant would be effectively sealed off from the world. 该核电厂将与外界完全隔离开。