Chinese

		name of a river	name of a river	clear; evident; plain clear; evident; plain; distinct
trad. (涇渭分明)		涇	渭	分明
simp. (泾渭分明)		泾	渭	分明
Literally: “to be as different as the waters of the (muddy) Jing and the (limpid) Wei”.

Idiom

涇渭分明

1. to be entirely different; to be completely distinct (right and wrong; good and bad)