lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / chán / zú / zhè / yī / lòu / xí / de / yóu / lái

历史课上，老师介绍了缠足这一陋习的由来。

In history class, the teacher explained the origins of the harmful custom of foot-binding.