Figure 1.1 Ancient decorated mill stone with a hand grinder from the Yucatan.

图1.1带有装饰的古代磨石和手磨台组合，出自尤卡坦。

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The grinder is to grind rubble pellet slab, natural stone and other pellet materials, and to provide small pellets material for the subsequent process.

人造石粗料粉碎机用来破碎颗粒板，天然石料及其它颗粒原料，为后序工序提供小颗粒原料。

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Stone implements included adze, arrowhead and grinder.

石器包括锛、镞、砺石等。

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