Lì / shǐ / kè / shàng / lǎo / shī / xiáng / xì / jiǎng / jiě / le / Liǔ / tiáo / Hú / Shì / jiàn / de / bèi / jǐng / hé / yǐng / xiǎng

历史课上，老师详细讲解了柳条湖事件的背景和影响。

In history class, the teacher explained the background and impact of the Mukden Incident in detail.