lessons
n. 课程；经验教训（lesson 的复数形式）
例句
He gives Italian lessons to his colleagues.
他给同事们上意大利语课。
《牛津词典》
The course book is divided into 30 lessons.
这本教科书分为30课。
We were just dossing about in lessons today.
今天我们在课堂上只是在混时间。
