Learn Wade-Giles! For people who already know pinyin! Wade-Giles doesn't use diacritics, and instead shows tones by just writing the number of the tone after the syllable, but everything is toneless in this course. The list is from the Library of Congress Pinyin Conversion Project (http://loc.gov/catdir/pinyin/romcover.html).
如果你早知道拼音,你可以学习韋氏拼音!
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