lǎo / shī / shì / fàn / le / nì / huí / yīn / de / tán / fǎ / rán / hòu / ràng / xué / shēng / fēn / duàn / liàn / xí

老师示范了逆回音的弹法，然后让学生分段练习。

The teacher demonstrated how to play the inverted turn and then had the students practice it in sections.