四川盆地是芥菜的次生起源中心。
我国是世界畜牧起源中心之一。
China is one of the cradles for animal husbandry in the world.
城市起源的过程就是聚落中心功能逐渐增强的过程；
With their central functions improving, cities came into being.
城市起源的过程就是聚落中心功能逐渐增强的过程；
With their central functions improving, cities came into being.
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