lì / shǐ / kè / shàng / lǎo / shī / jiě / shì / le / bāo / máo / zài / gǔ / dài / jì / sì / zhōng / de / yòng / tú

历史课上，老师解释了包茅在古代祭祀中的用途。

In history class, the teacher explained the use of bundled thatch in ancient rituals.