lǎo / shī / xiàng / xué / shēng / jiè / shào / le / gǔ / dài / zhǐ / nán / chē / de / gōng / zuò / yuán / lǐ

老师向学生介绍了古代指南车的工作原理。

The teacher explained how the ancient south-pointing chariot worked to the students.