shutoff stroke 关闭行程 Notice how the player follows through after each stroke. 注意那个球员在每次击球后怎样完成手臂动作。
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The disc's shutoff stroke is very short and under the effect of the spring, the valve can close quickly and prevent the big noise from water-hammering.
由于阀瓣的关闭行程缩短及弹簧作用可加速关闭效果，减少水锤及水击声。
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