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你好 hello こんにちはboujour ????? Part2: The origin of language Materialist theory Labor evolution theory Part2: The origin of language Labor decide the necessity and possibility of the origin of language. Part2: The origin of language Four stages of the origin Forelanguage stage Embryonic stage Immature language stage The mature stage Part2: The origin of language Forelanguage stage Ramapithecus (臘瑪古猿 ) Ramapithecus had already began to walk upright, and used natural tool frequently. with the dramatic changes of the environment, Ramapithecus must change their lifestyle, they lived from the tree to the ground in search of food. As a result of new methods of hunting for food, they developed a lot. Part2: The origin of language The human language capacity was also very weak at that time, they sent out ambiguous shouts or continuous sound. When they hunted for food or worked together, they often