Zhè / wèi / kē / rèn / lǎo / shī / zhǐ / fù / zé / jiào / shòu / shù / xué / bù / chéng / dān / bān / zhǔ / rèn / gōng / zuò

这位科任老师只负责教授数学，不承担班主任工作。

This subject teacher is responsible only for teaching math and does not serve as a homeroom teacher.