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There are roughly 102,465 commercial flights each day which, over a year, equates to about four billion air passengers per year. 世界上每天都有大概102,465个班次的商业航班，换算成一年，差不多就是40亿人次。 That's over half of the world's population who've sat on a flight, often for hours on end, and had time to think about planes and ask questions about them. 这所有坐过飞机的人已经超过地球人口的一半了，而且他们通常一坐就是几小时，有充足的时间来思考飞机的方方面面并对它们提出问题。 If you've ever stared out the window as your plane takes off, you will have seen a tiny hole in your window. 如果你曾经在飞机起飞的时候盯着窗外看，你会发现窗子上是有小洞的。 At first, it may seem like a weird addition, especially in something that's carrying a lot of people at a great height, but they're there for a very important reason: to stop the cabin from depressuring. 乍看之下，这个细节很诡异，尤其是它还出现在一个载着这么多人、飞得这么高的东西上，但其实它是有重要作用的：防止机舱减压。 As the plane gains altitude, the air pressure outside drops compared to the regulated air pressure inside the cabin. 随着飞机的飞行高度增加，飞机外面的气压会低于飞机内收到调控的气压。 | 
