Lift yourself off the floor by carefully shifting your center of gravity. Press your hands into the floor and slowly begin to rock your weight back, off your feet and onto your hands.
双手扎实地按向地面，慢慢将重量向后放，重心落在双手上，抬起双脚。
The in-line spring-actuated lift check also is referred to as the "silent check" because the spring closes the valve before gravity and fluid reversal can slam the valve closed.
由于这种止回阀能够在重力和介质倒流撞击启闭件之前关闭阀门，因此这种直通弹簧驱动升降式止回阀也称为“静音”止回阀。
Two legs to continue into the body lift on state body gravity fall, stand on his head on his shoulders, legs, two feet as far as possible unbend wearing tight slippers.
两腿继续上举成身体倒立状态，身体重心落在肩上，两腿尽可能伸直，两脚穿紧拖鞋。
"Lift off" takes a tremendous effort, but once we break out of the gravity pull, our freedom takes on a whole new dimension.
“起飞”需要很大的努力，不过，一旦我们打破了重力的作用，我们的自由将会进入全新的阶段。
Explain the stall in simple words is airplane lose lift and drop by gravity. In the training, the short time that the airplane drops is so exciting.
失速，用相对通俗的语言可以解释为：飞机失去了升力，然后在重力的作用下做面向地面的垂直运动。在训练中，飞机垂直下落的短短的时间很让我回味哦。
External Ballistics deals with projectile flight. The trajectory, or path, of a projectile is subject to the forces of gravity (see gravitation), drag, and lift.
外弹道学是研究射弹的飞行，弹道是射弹在重力、拖曳力和升力作用下的飞行路线。
Relax your arm (the whole body, actually), keep your wrist flexible, lift the hand from 5 to 20 cm above the keys (the shorter distance in the beginning), and let gravity drop your hand.
手臂放松(事实上是整个身体都要放松)，保持手腕柔软，然后将手抬高离开键盘5至20公分(开始时用较短的距离)，让手自然放下。
Relax your arm (the whole body, actually), keep your wrist flexible, lift the hand from 5 to 20 cm above the keys (the shorter distance in the beginning), and let gravity drop your hand.
手臂放松(事实上是整个身体都要放松)，保持手腕柔软，然后将手抬高离开键盘5至20公分(开始时用较短的距离)，让手自然放下。
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