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。
This upward force acting on your buoy is your support structure.
这种对你上半身的向上的力就是你的支撑结构。
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。
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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