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to prevent people from entering an area or building, often because it is dangerous
阻止人们进入一个区域或建筑物,通常是因为那里很危险;封锁,隔离
Two more bombs have been discovered since the police sealed off the area.
警察将这个地区封锁后,又发现了两枚炸弹。
Windows are usually sealed off.
窗户通常是封闭的。