Ball mill is an efficient tool for grinding many materials into fine powder.
球磨机是一种有效的工具磨许多材料成细粉。
Ball Mills are a very efficient tool for grinding many materials into a fine powder.
球磨机是一个非常有效的工具，许多材料研磨成细粉。
Ball Mills are a very efficient tool for grinding many materials into a fine powder.
球磨机是一个非常有效的工具，许多材料研磨成细粉。
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