As the barrel rotates, the material is crushed between the individual pieces of grinding media that mix and crush the product into fine powder over a period of several hours.

由于枪管转动时，该材料是碎石之间的个别件磨削媒体组合及粉碎产品成细粉近一个时期以来的几个小时。

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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。

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The increase of the cavity volume makes partial materials realize the air impact, the unbroken parts of which enter into the grinding zone and become fine powder after many times of impact.

容积腔增大，使部分物料实现了空中打击，其未破碎部分经过多次打击后进入研磨区形成细粉。

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