少数音节只有韵母和声调，没有声母。
A small number of syllables, however, have only finals and tones, but not initials, eg.
当一个音节没有声母而只含有一个韵母时，它可能会引起拼音上书写的混淆。
When a syllable with zero initial contains only a vowel, it could cause confusion in phonetic spelling.
当一个音节没有声母而只含有一个韵母时，它可能会引起拼音上书写的混淆。
When a syllable with zero initial contains only a vowel, it could cause confusion in phonetic spelling.
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