fǎ​zé

law

法则 (法則) fǎ​zé
law noun
an objective principle or scientific law governing natural or logical phenomena

Universal gravitation is a fundamental law of the universe.

rule noun
a standard, method, or set of regulations providing guidance for behavior or operations

There are many important operational rules in mathematics.

Frequency

Movie subtitles
7.15 per million appears in 3% of films
Written text
9.17 per million

Sources

Definitions
CC-CEDICT