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从唯物主义的观点来看人类发展的历史,第一次伟大的革命就是直立行走,即从祖先猿类的四足行走进化为人类特有的两足直立行走。正因为远古人类的祖先学会了直立行走,才将前肢解放出来,变为专门制造工具的双手。这样一个变革,从此便开创了人类的历史,人们对这一变革的充分认识来自非洲发现的人类祖先——南方古猿留下的脚印化石。人类在自然历史的长河中能够将300多万年
From a materialist point of view of the history of human development, the first great revolution is to walk upright, that is, evolve from four-legged walking of ancestral apes to two-legged upright peculiar to human beings. Precisely because ancestors of ancient human beings learned to walk upright, they liberated their forelimbs and turned their hands into a tool of special manufacture. Such a revolution has since created the history of mankind. People fully understand this change from the human ancestors discovered in Africa - the footprints fossils left by the Australopithecus. Human beings in the long history of natural history can be more than 300 million years