Air is forced up from the buoy counterweight tube during downward motion causing the balls to seal the air ports in the valve, thus forcing the air to flow into the whistle.
空气在向下运动过程中受到浮标向上的推力，使阀球将阀门里的气舱密封住，这样迫使气流进入雾笛。
Four-stroke engines of this type with this same type of intake valve motion but with a supercharger to make up for the loss of power density are known as Miller cycle engines.
四冲程发动机本与此同进气阀运动类型的类型，但以使增压器的功率损耗密度，这些都是为米勒循环发动机众所周知的。
No patients with significant valve disease or regional wall motion abnormality were included.
所有患者均无严重瓣膜病或节段性室壁运动异常。
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