lǎo / shī / xiān / yǎn / shì / qī / shēng / de / chàng / fǎ / zài / ràng / xué / shēng / zhú / yī / liàn / xí

老师先演示七声的唱法，再让学生逐一练习。

The teacher first demonstrated how to sing the seven tones and then had the students practice them one by one.