单词：trapdoors
(trapdoor 的复数) n. 地板门, 活板门, 活动天窗
plural of trapdoor
n. A lifting or sliding door covering an opening in a roof
or floor.
n. A door in a level for regulating the ventilating current;
-- called also weather door.
n. A lifting or sliding door covering an opening in a roof
or floor.
n. A door in a level for regulating the ventilating current;
-- called also weather door.