The black balls next to the box denote speed of the ship.
盒子旁边的黑球表示船速。
This greatly reduced the speed of the ship.
这样一来，大大降低了船的航速。
The crew trimmed the sails of the ship to achieve greater speed.
船员们随风扬帆以加快船速。
Most of speed controllers of main engine in ship use PID control method.
船舶主机的调速器主要采用比例积分微分(PID)控制规律。
Most of speed controllers of main engine in ship use PID control method.
船舶主机的调速器主要采用比例积分微分(PID)控制规律。
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