lǎo shī / ràng / wǒ men / liàn xí / shuāng yuán yīn / de / fā yīn / yóu qí / zhù yì / kǒu xíng / de / biàn huà

老师让我们练习双元音的发音，尤其注意口型的变化。

The teacher asked us to practice the pronunciation of diphthongs, paying special attention to changes in mouth shape.