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Pinyin/Tool
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
See also
Pinyin#Pinyin tone marking
a tool: a piece of equipment, usually one that you hold in your hand, that is designed to do a particular type of work
gongjuh: tongcharng shih shoougongjuh shehbeih, weih tehdihng gongzuoh err shehjih.