lǎo / shī / zài / kè / shàng / jiè / shào / le / pǔ / xiāo / de / huà / xué / chéng / fèn / hé / chuán / tǒng / yòng / tú

老师在课上介绍了朴硝的化学成分和传统用途。

The teacher introduced the chemical composition and traditional uses of mirabilite in class.