The rules are simple
As a Chinese idiom, Pinyin is l ì zh í J ì NJI ǎ n, which means that laws or prohibitions are simple and clear, so people can easily understand and abide by them. From the book of Jin, biography of Du Yu.
The origin of Idioms
In the book of Jin, Du Yu Zhuan: "it's easy to see the cases, but it's forbidden to commit them."
Idiom usage
As a predicate or attribute; used in law, etc.
The rules are simple
hear readily without comprehending what is heard - ěr shí zhī lùn