fā / yīn / kè / shàng / lǎo / shī / yòng / yín / cā / yīn / lái / jiě / shì / zhè / ge / yīn / de / fā / yīn / bù / wèi

发音课上，老师用“龈擦音”来解释这个音的发音部位。

In the pronunciation class, the teacher used “alveolar fricative” to explain where this sound is articulated.