What does escape mean? What do you mean? Who can help explain, thank you.

Cao Tingdong's Yu Yi is a book. From Zhou Qin Han to hundred schools of thought's books in Jin Song Qi Liang, Confucius' words were compiled into ten volumes and twenty articles, which were slightly like The Analects of Confucius, and its text was escaped by various classics, so it was called Yu Yi.

The escape language should be a language that is not found in other books. Or other languages where books are lost.