lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / ā / bá / sī / wáng / cháo / de / xīng / shuāi历史课上,老师介绍了阿拔斯王朝的兴衰。In history class, the teacher introduced the rise and fall of the Abbasid Empire.