In that historical and cultural setting, social class included upper, middle, working, and underclasses.

在这个历史和文化背景中，社会阶层包括上，中，劳动阶级和下层阶级。

youdao

Whether it is being sung spontaneously by rural people working in the field or travelling or performed more formally at one of more than a hundred traditional Hua er festivals held annually in these provinces, Hua er is an important vehicle for expressing personal feelings in a social setting and cultural exchange across ethnicities, as well as a popular rural entertainment.

UNESCO: Culture