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1·It is in accordance with the vowel letters, vowel combinations of letters, consonants and consonant-letter acronym in the open and closed syllable syllable pronunciation of the law of memory.

它就是按照元音字母、元音字母组合、辅音字母及辅音字母组合在开音节和闭音节的读音规律记忆。

2·To determine whether a syllable is closed or open, look at the vowel.

首先看看英文教程中关于开音节与闭音节的描述。