鱼书雁帛

Explanation: Refers to letters. 　　Source: Qing Li Yu, "Xian Qing Ou Ji device to play the system" is simply the word in the memo, there will be endless original meaning, fish, wild silk suits the book, do not have the type of bamboo thorn for Down? " Thesaurus:  Letters to Yan posts, Letters to the letter Yan