lì / shǐ / kè / shàng / lǎo / shī / xiáng / xì / jiè / shào / le / Tiān / jīn / Tiáo / yuē / de / bèi / jǐng / hé / yǐng / xiǎng

历史课上，老师详细介绍了天津条约的背景和影响。

In history class, the teacher explained the background and impact of the Treaty of Tianjin in detail.