Blue-collar refers to all wage-earners who are mainly manual workers, such as ordinary industrial and mining workers, agricultural workers, construction workers, dockers, warehouse managers and so on. Blue-collar workers belong to middle-income groups. At present, there is a shortage of blue-collar high-tech talents in China, and blue-collar education should be a continuing education for this group of people. I also heard that Huayin Swan Lake has a large blue-collar training and education base.