lǎo / shī / ràng / xué / shēng / liàn / xí / jiǎn / shǎo / bí / yīn / fā / yīn / yào / gèng / qīng / chǔ

老师让学生练习减少鼻音，发音要更清楚。

The teacher asked the students to practice reducing nasal sounds and making their pronunciation clearer.