lǎo / shī / bō / fàng / lù / yīn / ràng / wǒ / men / fēn / biàn / qí / zhōng / de / hóu / cā / yīn

老师播放录音，让我们分辨其中的喉擦音。

The teacher played a recording and asked us to identify the guttural fricative in it.