Pitching distance
It is a Chinese idiom, Pinyin is t ó ush í B á J ù, which means martial arts practice in ancient army. It comes from the biography of Gan Yanshou in Hanshu.
Idiom explanation
It's the same as "throwing stones at a distance".
The origin of Idioms
Ban Gu's biography of Gan Yanshou in the book of Han in the Eastern Han Dynasty: "the distance between the two is equal."
Idiom usage
Used as an object or attribute; used in writing
Pitching distance
give up completely to natural impulse - zì qíng zòng yù
improve learning and hide the sword - xiū wén yǎn wǔ