lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / xī / bān / yá / liú / gǎn / de / chuán / bō / qíng / kuàng

历史课上，老师介绍了西班牙流感的传播情况。

In history class, the teacher discussed how the Spanish flu spread.