lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / bā / zì / fāng / zhēn / zài / jīng / jì / jiàn / shè / zhōng / de / zuò / yòng

历史课上，老师介绍了八字方针在经济建设中的作用。

In history class, the teacher introduced the role of the eight-character policy in economic development.