yǔ yīn / kè shàng / lǎo shī / ràng / wǒ men / bǐ jiào / sè yīn / hé / cā yīn / zǔ ài / qì liú / de / fāng shì语音课上,老师让我们比较塞音和擦音阻碍气流的方式。In phonetics class, the teacher asked us to compare how stops and fricatives obstruct airflow.