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How to distinguish peer groups, professional groups, social groups and ethnic groups?
Peer group: people born at the same time, such as post-80 s and post-90 s.

Occupational groups: professional life classes, such as blue-collar class and white-collar class.

Social groups: mainly the division of social life, such as civil servants, leaders, self-employed, migrant workers and so on.

Ethnic groups: We have 56 ethnic groups alone, understand?