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trapdoor
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1.N-COUNT 可数名词 活板门;通气门；活动天窗 A trapdoor is a small horizontal door in a floor, a ceiling, or on a stage.
A lifting or sliding door covering an opening in a roof orfloor.
UK noun countable
a small door in a ceiling or floor （天花板或地板上的）活板门，地板门 There's a trapdoor into the attic. 有扇活板门通向阁楼。