The airplane dissolves into thin air, as if erased by an invisible hand.
飞机如同无形的手划过稀薄的空气。
One way is to try to design a completely air-tight train, like an airplane cabin.
一种方法是试着设计一个完全密闭的火车，像飞机舱一样。
The young hour is air force's airplane pilot, now is to retires the engineer!
China年青时是空军飞行员，现在是退休工程师！
The young hour is air force's airplane pilot, now is to retires the engineer!
China年青时是空军飞行员，现在是退休工程师！
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