被關住的一段空氣，把兩邊隔開
兩個意思共用同一個畫面，差別只在這段空氣是幫手還是麻煩。
noun · B2
A small room with a door at each end, built between two spaces where the air is not the same. People and things move through it from one side to the other without letting the air rush across.
氣閘室
核心畫面
You can picture a pocket of air held in the middle, keeping two sides from meeting. Sometimes people build that pocket on purpose, so that a person can pass from one side to the other in safety. Sometimes the air gets in by itself and simply blocks the way.
可以想成中間卡著一段被關住的空氣，兩邊因此不會直接相通。有時候這段空氣是人特意留下來的：太空船上留一個小房間，人先進…更多收起
可以想成中間卡著一段被關住的空氣，兩邊因此不會直接相通。有時候這段空氣是人特意留下來的：太空船上留一個小房間，人先進去、門關上、空氣調好，再走到另一邊，這樣外面的空氣就不會衝進來。有時候它是自己跑進去的：水管裡混進一小段空氣，水就推不過去。同樣一團空氣，一種是拿來當關卡，一種是變成阻礙。One branch