这样说是要人们注意到美国社会的复杂性。
To say so is to draw attention to the complexity of the American scene.
社会的复杂性源自社会物质系统和社会思想系统中同层次和不同层次间的相互作用。
The complexity of society originates from the interaction among same layers of different layers in the social material system and the social thinking system.
另一些专家则强调人类社会的复杂性和等级制度造成的影响，以及农产品出现剩余，引发掠抢。
Others emphasize the influence of complex and hierarchical human societies, and agricultural surpluses to be raided.
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