lì / shǐ / kè / shàng / lǎo / shī / xiáng / xì / jiǎng / jiě / le / Nán / chāng / Qǐ / yì / de / bèi / jǐng

历史课上，老师详细讲解了南昌起义的背景。

In history class, the teacher explained the background of the Nanchang Uprising in detail.