Lǎoshī / ràng / wǒmen / tīng / yí / duàn / mínjiān / yīnyuè / ránhòu / jièshào / tā / de / tèdiǎn老师让我们听一段民间音乐,然后介绍它的特点。The teacher asked us to listen to a piece of folk music and describe its features.