yīn yùn xué / zhōng / de / sān shí liù zì mǔ / fǎn yìng / le / zhōng gǔ hàn yǔ / de / shēng mǔ / xì tǒng音韵学中的三十六字母反映了中古汉语的声母系统。The thirty-six initials in phonology reflect the initial consonant system of Middle Chinese.