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。
2
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。
3
Stone implements included adze, arrowhead and grinder.