Interpretation of the old imperial calendar

Metaphor is an outdated old rule. The origin of the idiom: Lu Yao's Ordinary World, Volume III, Chapter 16: "Since social change has become an ironclad fact, smart people should not hold an old imperial calendar to the end."

Example of idiom: We can't take any more pictures.

Synonym of old yearbook: old yearbook

Idiom grammar: as object and attribute; Used in spoken English