long-standing
It is a long-standing Chinese idiom, Pinyin is y ó UL á iy ǐ Ji ǔ, which means that it has been a long time since something happened. It's from a new saying of the world - moral conduct written by Liu Yiqing of the Southern Song Dynasty.
The origin of Idioms
Liu Yiqing of the Southern Dynasty, Song Dynasty, wrote in the book "a new account of the world · moral conduct": "the prince respects his illness, and the Taoist school should take the first step in the last chapter, and ask him about the similarities and differences in the origin of Zijing." Gao Yang's the complete biography of Hu Xueyan vanishes: "France covets Vietnam, ~"
Idiom usage
To use as a predicate or attributive; to use in something, etc.
long-standing
a clear conscience in the still hours of the night - qīn yǐng wú cán
list in detail and make careful analysis - máo jǔ lǚ xī
an author with many works to his credit - zhù zuò děng shēn