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Pinyin/Research
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Pinyin#Pinyin tone marking
Research is a careful study of a subject, especially in order to discover new facts or information about it.
yarnjiu shih duih 1'g zhuutir d xihxin xuerxir, yourqirshih weihle faxiahn yoouguan xin d shihshir huoh xihnxi.