turned ball meaning in Chinese

车制的钢球

Smith played a turning ball on to the stumps
史密斯一个回头球，打到了自己的三柱门上。
Ball valve uses ball with circular hole as open - close part , through turning ball with stem to realize on - off movement . ball valve is mainly applied to stop , distrubute and change flowing direction of medium
球阀是用带圆形的通孔的球体作启闭件，球体随阀杆转动，以实现启闭动作的阀门，球阀在管道中主要用于切断，分配和改变介质流动方向。