There are four stages in the process of human civilization progress, which are the tool age, the agriculture age, the industry age and the knowledge age.
人类文明进程可以分为四个时代：工具时代、农业时代、工业时代和知识时代。
There are four stages in the process of human civilization progress, which are the tool age, the agriculture age, the industry age and the knowledge age.
人类文明进程可以分为四个时代：工具时代、农业时代、工业时代和知识时代。
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