Lhasa in Cantonese means "garbage". According to the relevant information, garbage is an abandoned item that has lost its use value and cannot be used, and it is an important link in the material cycle. It is an unnecessary or useless solid and fluid substance. In densely populated cities, garbage disposal is a headache. The common practice is to collect them and send them to landfills for landfill treatment, or to incinerate them in incinerators.