【纪录片】航空的几个为什么

• file:Business Insider 为什么飞机起降最危险 Why Takeoff And Landing Are So Dangerous.1080p.AVC.jlpzj.chs&eng.mp4
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• file:Tech Insider 航空的几个为什么 A Few Why-and-hows about Aviation.1080p.jlpzj.chs&eng.mp4
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• folder:【纪录片】航空的几个为什么