That is, since the stress of a Mongolian word falls on the first syllable, the short vowel of the first syllable is pronounced as clear and grand-sounding, and on the contrary non-first-syllable short vowel weakens or even disappears.

• 关于这一现象的形成原因,大多数学者认为与蒙古语的重音位置有关,蒙古语词重音在词首音节,所以词首音节短元音发音清晰响亮,非词首音节短元音就弱化以至脱落。