What are the white trails that planes leave in the sky?
飞机在天空上留下的白色拖尾是什么?
Those white lines in the sky are called vapor trails or contrails, and they are the result of aviation fuel being burned. When the fuel is burned, it produces carbon dioxide and water, which condenses into tiny droplets behind a plane in the air. If you pay close attention, you can see that there's always a gap between a plane and the vapor trails—that's because it takes time for the gas to form as droplets. The more you know!
那些在空中留下的白线叫做水汽尾迹或是凝结尾迹,它们产生于航空燃料的燃烧。燃油燃烧时,产生了二氧化碳和水汽,这些飞机排出的水汽在空中凝结成小水滴。如果你仔细留意,你会看到飞机和水汽尾迹之间总是有段间隙——那是因为水蒸气变成水滴需要一点时间。现在你知道更多了!
Can a plane door actually open mid-flight?
飞行途中机舱门真的可以打开吗?
Rest assured, it cannot. In fact, it's actually impossible. The cabin pressure simply won't let you. As askthepilot.com explains, "At a typical cruising altitude, up to eight pounds of pressure are pushing against every square inch of the body of the aircraft. That's over 1,100 pounds against each square foot of door."
放心,它打不开。事实上,这是不可能的。仅仅是舱内的压强就不会允许你这么做。航空飞行探索博客AskThePilot是这样解释的,“在特定的巡航高度,飞机机身的每一平方英寸上都承受着高达8磅的压强。机舱门上相当于有1100磅/平方英尺的压强。”
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