以下为句子列表：
英文: Net ball is a very common fault.
中文: 落网球是非常常见的失误。
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英文: Planet ball mill with have 4 ball rub pot by fashion, once can make 4 different samples, study the new prescription for the technical staff, has developed the new technology material and provided convenience.
中文: （一）行星式球磨机同时装有4个球磨罐，一次可做4个不同的试样，为技术人员研究新配方，开发新技术材料提供了方便。
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