In time
As a Chinese idiom, Pinyin is j í J ī Ni á nhu á, which means that in ancient times, when a woman was engaged, she would hairpin at 15, and when she was not engaged, she would hairpin at 20; it refers to the age when a girl could get married. It comes from the book of rites.
Notes on Idioms
Hairpin: Ancient hairpin used to plate hair.
The origin of Idioms
According to the book of rites, there are six hairpins for ten women
Idiom usage
Used as an object or attribute; used in writing.
In time
If you keep green hills, you are not afraid of no firewood - liú dé qīng shān zài,bù pà méi chái shāo