rare
It is a Chinese idiom. Pinyin is Qi āǎǎ in á NY ù, which means it is hard to meet once in a thousand years. From Camel Xiangzi.
The origin of Idioms
Lao She's "Camel Xiangzi" 5: "it's not easy to earn money with all one's strength, and everyone hopes to make some evil money; since evil money is so rare, some colorful people must be different and have great fortune."
Analysis of Idioms
Antonym: once in a thousand years, once in a hundred years
Idiom usage
The opportunity is extremely rare.
rare
good teachers and helpful friends - liáng shī yì yǒu
birds of a feather flock together - rén yǐ qún fēn
practise bribery or receive bribes publicly - huò lù gōng xíng