单词：trap-door
trap-door的用法和样例：
例句
- In one corner a ladder went up to an open trap door.角落里有一道梯子，通往上面敞开的活板门。
- Elevator maintenance can be carried out from outside the well through a trap.可以通过活板门在电梯运行井道外维修电梯。
单词：trap-door 相关文章
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