The lift of fin would vanish at anchor. Because the speed of water flow across the surface of fin stabilizers is zero on this condition.
船舶在低航速或零航速情况下，由于流过鳍表面的水流速度为零，鳍上升力也将消失，因而此时减摇鳍几乎不能进行减摇。
Under high frequency usage condition, the internal leakage flow rate of the piston is almost near zero condition.
在高频使用状态下，活塞的内泄漏量几乎接近于零状态。
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