However, they are all targeted. For example, some hamburger shops at the school gate are not very demanding, because most students didn't eat in the morning and bought them to satisfy their hunger, so when they are hungry, they have to fill their stomachs first, and there is no time to take into account the taste quality.
All kinds of goods have different levels of demand, so does hamburger, which is expensive and cheap. The cost of cheap hamburgers is bound to be very low, so it is a matter of concern that the materials are not safe and hygienic, so you must be careful when buying them.