(n.) 授课
His lecture was boring and half the students fell asleep.
他讲的课很无聊，一半的学生都睡着了。
laboratory 
(n.) 实验室
My chemistry class includes laboratory work.
我的化学课包括实验。
do someone good
对人有好处
The fresh air will do you good after being the house all day.
在屋子呆了一整天，吸吸新鲜空气对你是大有益处的。
