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。

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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。

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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。

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Cyclical stocks should perform handsomely in 2013, as improving fundamentals and rock bottom expectations force an upward reassessment of valuations.

FORBES: Small-Caps Could Usher In The New Year With A Bang

Even less normal for an Anglican church in the Georgian period is the outward emphasis on the force of gravity rather than any upward possibility of heavenly grace.

WSJ: St. Mary Woolnoth | Nicholas Hawksmoor | Fortress of God | Masterpiece by Richard B. Woodward