letter
Letters, also known as books, Kai, Jian, slips, Jane, Zha and so on. It is a kind of communication form that people write on paper (or other text record body), image is content. In ancient China, also referred to as "book" or "ruler" and so on, in, for example, Sima Qian to a friend of any letter is called "reported safety book." "Pieces" was first seen in the Western Han Dynasty classics, Sima Qian's "Historical Records warehouse public biography" cloud: "Ti Ying Tong" feet ", the father later Ning. "The ancient epistle is called the slips, because the letters used in the bamboo or silk silk about one foot, so this said ....