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Yuanmou people from 21 BC, is China's long period of primitive society .
从元谋人到公元前21世纪，是中国漫长的原始社会时期。
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In Neolithic period, primitive types of agriculture were done.
原始的农耕形式在新石器时代宣告终结。
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In Neolithic period, primitive types of agriculture were done.
原始的农耕形式在新石器时代宣告终结。
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