Mainly because of the timelessness and universality of letter creating, extant letters from earlier eras represent a vital classification of source materials in historiography (the methodology of historians). Relevance of letters from the 18th century[edit] Zhuyin, in some cases referred to as Bopomofo, is a semi-syllabary. It transcribes Mandarin phonetically https://nahjalbalagha44219.blogocial.com/sermons-things-to-know-before-you-buy-62073147