Jīng Wèi​fēn​míng

distinct

泾渭分明 (涇渭分明) Jīng Wèi​fēn​míng
distinct idiom
to have a clear-cut distinction or be entirely different, analogous to the visible boundary where the Jing and Wei rivers meet but do not mix

Frequency

Movie subtitles
0.120 per million appears in 0% of films
Written text
0.534 per million

Sources

Definitions
CC-CEDICT