lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / zhè / zhī / lián / hé / jiàn / duì / de / zǔ / chéng / hé / rèn / wù

历史课上，老师介绍了这支联合舰队的组成和任务。

In history class, the teacher introduced the composition and mission of this combined fleet.