“活板门”怎么读？

角落里有一道梯子,通往上面敞开的活板门.In one corner a ladder went up to an open trap door.这位女主妇砰的一声关上活板门.The woman shut the trapdoor with a slam.赫敏·格兰杰: 它站在一扇活板门上.Hermione Granger: It was standing on a trap door....

“活板门”的英语可以翻译为：trap，trap-door，trapdoor ...