人类没有尖牙利齿，劳作、狩猎、自卫，都离不开工具和武器。早期的工具只能利用石头、植物的枝干或动物死后留下的骨骼。考古学家在史前时期人类遗址中找到了不可胜数的石器，它们应有尽有，然而大同小异。在中国浙江省余姚河姆渡７０００年前的人类遗址中，发掘出数以千计的 Humans do not have sharp teeth and teeth, work, hunting, self-defense, are inseparable from the tools and weapons. Early tools used only rocks, plant stems or bones left behind by animals. Archeologists have found countless stone tools in prehistoric man’s ruins, and they have everything they can, but they are more or less identical. Thousands have been excavated from human sites in 7000 years ago in Hemudu, Yuyao, Zhejiang Province, China