In China, it is universally acknowledged that porcelain was introduced in Eastern Han Dynasty in the strict sense.

在我国，众所公认的、真正意义上的瓷器之出现当在东汉时期。

You could say that this isn't writing in the strict sense, it's more a kind of mnemonic, a repertoire of signs that can be used to carry quite complex messages.

你可以说这样的书写并不算是严格意义上的文字，而更像是一种记忆法，一种可以用来承载极复杂信息的符号集合。