lì shǐ kè shàng / lǎo shī / jiè shào / le / ān xī guó / zài / sī chóu zhī lù / shàng / de / zuò yòng

历史课上，老师介绍了安息国在丝绸之路上的作用。

In history class, the teacher introduced the role of Parthia along the Silk Road.