Definition: refers to mud and sand washing down with the water in the rapids of a river. It is a metaphor for the mixing of good and bad people.

Source: Qing Dynasty - Yuan Mei, "Poems from the Garden", Volume 1: "People say that those who have great talent are like the Yellow River, which flows down with the mud and sand. I think that this is coarse talent, not great talent."

Example sentence: while our country is practicing the policy of reform and opening up; it is also necessary to prevent Western spiritual pollution; ~.