It's called a plug door, and it basically acts like a bathtub-drain stopper, corking the hole without falling through.
这叫做内嵌式门，功能基本上如同浴缸的下水塞子，堵住孔又不会掉进去。
Plug door
原声例句
透视百科科技类
中文百科
内崁式门
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内崁式门（嵌入式门）（plug type door）是指一种利用门内及门外气压差异以紧闭的门，门边采用楔形设计令接合更为紧密。内崁式门一词也有用于描述楔形设计的平拉门（塞拉门）。
英语百科
Plug door 内崁式门
A plug door is a door designed to seal itself by taking advantage of pressure difference on its two sides and is typically used on aircraft with cabin pressurization. The higher pressure on one side forces the wedge-shaped door into its socket, making a good seal and preventing it from being opened until the pressure is released.
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