yǔ / yán / xué / kè / shàng / lǎo / shī / jiě / shì / le / yīn / wèi / hé / yīn / sù / de / qū / bié

语言学课上，老师解释了“音位”和音素的区别。

In linguistics class, the teacher explained the difference between phonemes and phonetic segments.