金科玉律 jīn kē yù lǜ

DEFINITIONS

  1. golden rule
  2. key principle

CHARACTERS

金 jīn
HSK 4
gold; metals in general; money
科 kē
HSK 4
section, department, science
玉 yù
HSK 5
jade, precious stone, gem
律 lǜ
HSK 4
statute, principle, regulation