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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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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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