Lì / shǐ / kè / shàng / wǒ / men / xué / xí / le / Zhèng / Hé / xià / Xī / yáng / de / gù / shi

历史课上，我们学习了郑和下西洋的故事。

In history class, we studied the story of Zheng He's voyages to the west.