lǎo / shī / jīng / cháng / tí / xǐng / xué / shēng / bǎo / chí / zhèng / què / de / zuǐ / xíng / lái / fā / yīn

老师经常提醒学生保持正确的嘴型来发音。

Teachers frequently remind students to maintain proper mouth shape for pronunciation.