The spinning of the propellers generates the necessary lift, or upward force, to raise the platform.
螺旋推进器快速旋转，生成必要的上升力，使平台升起。
An upward force must be exerted on it so as to lift an object.
要提起重物必须向它施加一个向上的力。
The upward force that a fluid exerts on an object less dense than itself.
施加给比自己密度小的物体的向上作用的力。
Moreover, the effect of real gas for small angle-of-attack case results in small downward force moment, whereas that for large angle-of-attack case results in small upward force moment.
此外，小攻角时真实气体效应产生小低头力矩，而大攻角时产生小抬头力矩。
Analyzed from the stress Angle, the lathe-bed is mainly imposed by a vertically upward force, moreover, the lathe-bed is not slender, so the direction of tangential stress should not be ignored.
从床身的受力角度看来，床身主要受到垂直方向上的力，而且床身不是细长的结构，切应力的方向不能忽略。
Suffer the effect of gravity raindrop falls, when updraft, will have an upward force in rain, make its slow down, and a little rain may also be brought up.
雨滴受地心引力的作用而下降，当有上升气流时，就会有一个向上的力加在雨滴上，使其下降的速度变慢，并且一些小雨滴还可能被带上去。
In a fluidised bed a fluid is passed through a bed of particulate solids at a velocity sufficient to provide an upward force equal to the weight of the particles, therefore buoying the particles.
在流化床中，流体通过固体颗粒床层，其流速足够产生一个与颗粒重量相等的向上的力。因此而使颗粒悬浮。
In a fluidised bed a fluid is passed through a bed of particulate solids at a velocity sufficient to provide an upward force equal to the weight of the particles, therefore buoying the particles.
在流化床中，流体通过固体颗粒床层，其流速足够产生一个与颗粒重量相等的向上的力。因此而使颗粒悬浮。
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