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.

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其反作用力F’为物块对人施加的力。

The reaction is the force F'exerted by the block on the man.

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其反作用力F’为物块对人施加的力。

The reaction is the force F'exerted by the block on the man.

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