zài / yǔ yīn xué / kè / shàng / lǎo shī / ràng / wǒ men / fēn biàn / fù yuán yīn / hé / dān yùn mǔ

在语音学课上，老师让我们分辨复元音和单韵母。

In phonetics class, the teacher asked us to distinguish compound vowels from simple finals.