lǎo / shī / yāo / qiú / xué / shēng / yuè / dú / chéng / xù / mǎ / bìng / shuō / míng / měi / gè / bù / fèn / de / zuò / yòng

老师要求学生阅读程序码，并说明每个部分的作用。

The teacher asked the students to read the source code and explain the function of each part.