lǎo / shī / zài / kè / táng / shàng / bāng / zhù / xué / shēng / zhèng / yīn / jiū / zhèng / tā / men / de / fā / yīn

老师在课堂上帮助学生正音，纠正他们的发音。

The teacher helped the students correct their pronunciation in class.