lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / běi / yáng / shuǐ / shī / de / xīng / shuāi

历史课上，老师介绍了北洋水师的兴衰。

In history class, the teacher discussed the rise and fall of the Beiyang Fleet.