原始农业的出现，人们有了可靠的食物来源。
The emergence of primitive agriculture, it is a reliable source of food.
于是，这一时期人类开始了原始农业和畜牧饲养的生产型经济。
Thus, the age of productive economy of primitive agriculture and stockbreeding was coming.
于是，这一时期人类开始了原始农业和畜牧饲养的生产型经济。
Thus, the age of productive economy of primitive agriculture and stockbreeding was coming.
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