以下为句子列表：
英文: 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.
中文: 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。
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英文: With good transversal rupture strength and wear resistance, it is suitable for low-speed rough turning and milling of heat resistanct alloys, titanium alloys and of plastics glass well.
中文: 具有很高的抗弯强度和良好的耐磨性能，适用与低速粗车和铣削耐热合金、钛合金，也可加工玻璃钢。
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英文: Methods The people in the observation group washed their hands through turning off the water tap with treadle and the people in the control group,with hand.
中文: 方法 观察组用蹋板开关洗手，对照组用手拧水龙头开关洗手，洗手后经细菌培养，结果经X 检验；
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