Because the duck walked in the water, feet can be reduced buoyancy, can float on the surface of the water, and won't sink.
因为鸭子在水中行走的时候，脚可以减少浮力，能浮在水面上走，而不会沉下去。
When the float upward force and float suffered gravity, buoyancy and viscous forces of the force equal to three when the float is in equilibrium.
当浮子上升的力与浮子所受的重力、浮力及粘性力三者的合力相等时，浮子处于平衡状态。
When the float upward force and float suffered gravity, buoyancy and viscous forces of the force equal to three when the float is in equilibrium.
当浮子上升的力与浮子所受的重力、浮力及粘性力三者的合力相等时，浮子处于平衡状态。
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