Fast and fast
As a Chinese idiom, the Pinyin is l ó ngch í h ǔ zh ò u, which means to compete with each other in troubled times. It's from up the river.
The origin of Idioms
Shen Shoumin of the Ming Dynasty wrote in the book "ascending the river" that "the dragon and the tiger come out suddenly, and the real man comes out, holding his hand to divide the chaos."
Idiom usage
As an object or attribute; used in troubled times, etc.
Fast and fast
become wiser after being duped - shàng dāng xué guāi
The next generation is replaced by the next - xià líng shàng tì