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。
Though an ion engine could never lift a spacecraft out of Earth's gravity well.
尽管离子发动机不能使航天飞机很好地摆脱地球引力。
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