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人类习惯於日常的地面生活,虽然与地心吸力(简称重力)发生密切的关系,但是从不在意。如果离开了地面,飞行在空中的时候,环境迫使你不得不去体会,重力是如何的在作用於你的身体,尤其是飞行速度或方向改变的时候,重力的作用特别明显,在严重的时候重力作用於飞行员的身体及飞机本身,甚至达到不能耐受的程度。当飞机沿着直线作水平飞行时,速度保持一定,飞行员的处境就如你现在看书的情形一样,一点都不特别。如果控制不好,重力作用於飞行员的身体及飞机,很可能把飞行员摔出机舱,从高空中很快的拉向地面,撞成粉碎。在起飞的时候
Human beings are accustomed to daily life on the ground. Although they are closely related to gravity (gravity), they never mind. If you leave the ground and fly in the air, the environment forces you to have to understand how gravity is acting on your body, especially when the speed or direction of the flight changes, and the effect of gravity is especially pronounced. In times of severeness Gravity acts on the pilot’s body and the aircraft itself, even to an unacceptable level. When the plane is flying straight along a straight line, the speed stays the same, and the pilot’s situation is the same as if you were reading a book now, not at all. If the control is not good, gravity acting on the pilot’s body and aircraft, it is likely that the pilot fell into the cabin, pulled from the sky quickly to the ground, smashed into smash. At the time of takeoff