A slow arrow leaves the string
It's a Chinese idiom. Pinyin is n ǔ Ji à NL í Xi á n, which means very fast. It comes from the orphan of Zhao family by Ji Junxiang of Yuan Dynasty.
The origin of Idioms
The first fold of Zhao's orphan written by Ji Junxiang in Yuan Dynasty: "if I take you to go, it's like an arrow leaving the string; if I call you back, it's like a feather on the carpet."
Idiom explanation
The metaphor is very fast.
A slow arrow leaves the string
talk till one's tongue and lips are parched - chún jiāo shé bì