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Pinyin/Development
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
See also
Pinyin#Pinyin tone marking
Development is the gradual growth of something so that it becomes more advanced, stronger, etc.
fazhaan shih mooushihwuh d zhurjiahn cherngzhaang, biahnde gehng xianjihn, qiarngdah, deeng.