The division of labor of hand and foot, it is a milepost of human evolution.
手与脚的分工，是人类进化的一个里程碑。
Specialization is a product of human societal evolution within the division of occupations.
教师专业化是社会分化与职业分化的产物。
Specialization is a product of human societal evolution within the division of occupations.
教师专业化是社会分化与职业分化的产物。
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