拼音 is a romanized Cantonese pronunciation. There are some kinds of 拼音 system in Cantonese and they are a little different in some cases. CPIME supports multi 拼音 methods: 教院式(Standard Cantonese Pinyin), 耶魯(Yale), 粵拼(Jyutping), 劉錫祥(Sidney Lau). This page shows you what is the difference among them and which 拼音 method is suitable for you.
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