What do you mean by dirty work?

The concept of "poor schools" comes from the concept of "three religions and nine streams", which is the grade difference between schools due to the position of people in the hegemony of long schools. Needless to say, the "three religions" mentioned in the title, it is obvious that "poor schools" are actually stratified again in "poor schools" "Poor school" is divided into three classes, which are upper, middle and lower classes, and "poor school" is the worst occupation in the whole. As for "poor schools"

The first one: In the Ming and Qing Dynasties, there was a jingle that mentioned nine low-level occupations: "First-class actors push second-rate, third-rate tortoise, fourth-rate tortoise, five scraping, six wiping back, seven prostitutes and eight thieves, and nine blowing". Actors refer to all kinds of actors, pushing refers to coolies pushing goods with trolleys, and turtles refer to the operators of brothels. Turtles are handyman in brothels, including those who use themselves. Back wiping refers to the service personnel in bathhouses and bathrooms, which is common in the north. Prostitutes naturally refer to prostitutes, thieves refer to thieves and robbers, and soot blowing refers to people who sell hookahs. These professionals were the lowest people at that time and also the representatives of the lowest people. It is said that even beggars have a low status.

The second one: "First-rate witches, second-rate prostitutes, third-rate immortals and fourth-rate gangsters, five shaved heads, six blow hands, seven plays, eight called nine selling sugar." From the beginning to the end, the corresponding occupations are wizards who draw spells to exorcise ghosts, prostitutes, witches possessed by immortals who treat diseases in the form of dancing, night watchman who works overtime, hairdressers, drummers, actors on stage, beggars, beggars, and vendors who sell candied haws or candied products like candied haws.

The third one: "first-class door soap, second-class witch, third-class tooth, fourth-class ni, fifth-class flower woman, six miscellaneous uses, seven nests, eight thieves and nine prostitutes."

They are porters, wizards, intermediaries, nuns, matchmakers, handymen, thieves and prostitutes.

Judging from these folk sayings, in fact, low-income people basically refer to the bottom people engaged in the service industry.