the red-light district
Liushi Huajie, a Chinese idiom, is Li ǔ sh ì Hu ā Ji ē in pinyin, which means the place where brothels gather. It comes from Fu Hui Quan Shu, post office, chasing prostitutes.
The origin of Idioms
In Huang Liuhong's Fu Hui Quan Shu, post office, chasing prostitutes in the Qing Dynasty, it was said that "many prostitutes were set up in evil alleys, so they became Yingchao yanlei, and became Liushi Huajie."
Idiom usage
A place where brothels gather.
the red-light district
have no contact with each other - shuǐ huǒ wú jiāo