trap door

基本解释

Its white stripe is visible, but its head is hidden behind the trap door.
身上有白色条纹，但把脑袋躲在陷阱笼门的后面。
As liquid rushes in, the plant sucks in the prey, such as a small crustacean, that triggered the trap door's opening.
当像小甲虫一样的小虫触发了陷阱门的机关，液体就冲了进来，植物就卷住了猎物。
When the trap door shuts, the plant excretes mucilage next to a special cuticle around the door, creating a watertight seal.
当陷阱阀门关闭的时候，植物在阀门周围的特殊角质层上分泌粘液，形成不透水密封垫。

So, what you do is you set up a couple of displays, one where the block is stopped, the other one where you take this away with a trap door and it keeps going.
所以,你可以设计几个演示,一个是木块被挡住了,另一个是用活门把木块挪开,使得屏板继续上升
耶鲁公开课 - 心理学导论课程节选
Suppose standing on the bridge next to the fat man, I didn't have to push him, suppose he was standing over a trap door that I could open by turning a steering wheel like that.
假设我站在桥上，胖子就在我旁边，我不用去推他，假设他踩在一扇活板门上方,而活板门可以通过转动方向盘来开启。
耶鲁公开课 - 公正课程节选

President-elect Obama shows a remarkable ease with which he pushes useful colleagues through the trap door.
FORBES: Obama's Cold Heart Might Be A Good Thing