yán jiū《Qiē Yùn》lǐ de xiǎo yùn huà fēn，yǒu zhù yú wǒ men liǎo jiě zhōng gǔ hàn yǔ de yǔ yīn xì tǒng。

研究《切韵》里的小韵划分，有助于我们了解中古汉语的语音系统。

Studying the division of homophone groups in the ancient rhyme book 'Qieyun' helps us understand the phonetic system of Middle Chinese.