Irregular syllables in Mandarin—how does 二 ("èr") exist?
there are word have the same pronounciation with 二 like 儿 而 耳 尔.and there are more vowel-consonant constuctions like 昂 肮 盎 pronoinced ang .there are even more vowel-vowel constructions like 奥 凹 袄 pronouced ao and 爱 矮 挨 pronounced ai.it is nothing about ealier and I dont know the reason neither.but I hear some experts said the ancient chonese language is far more difference sounded like now