那个剧场的门是弹簧门。
弹簧门被打开后可以自动弹回。
The swing door will resile automatically after it has been opened.
他打开了门，原来是他用一块粘土塞在门上弹簧扣所在的那个洞里，使得门锁不紧。
He opens the door and reveals that he's kept the door from being locked by jamming a piece of clay into the hole where the latch catches the door frame.
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