What do you mean by going up and down the river?

"Que" is a section of music, and upper que and lower que mean "upper and lower two sections". Because words come from the lyrics of a song, they are described in musical terms.

"Jiangchengzi" is a epigraph, that is, a form of writing. Its "format" has two kinds, one is no paragraph, the other is "double tone", which is repeated on the basis of the original song, so the lyrics are two paragraphs, called up and down, also called up and down film.