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The upward force at 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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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.
The upward force of a liquid is called buoyancy, which can keep some objects up.
液体向上的力称为浮力, 它能使某些物体不沉下去.
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