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开场语:大约300多万年前,人猿相揖别,人类的祖先从树上下到了地面。伴随着直立行走,他们学会了制造工具,开始根据劳作对象的不同,使用一些有意打制成不同形状的石器,考
Opening words: about 300 million years ago, the apes were not, the ancestors of human beings from the tree down to the ground. Along with walking upright, they learned to make tools and began to use stone tools intended to be shaped into different shapes according to the different objects of labor