He spoke on the first day of classes at a high school in Virginia.

VOA: special.2009.09.10

Typically, we will not in fact have classes on Fridays, just this week and next for shopping week and Labor Day.

我们一般不在周五上课，只是因为本周和下周是购物周,还有劳动节。

哈佛公开课 - 计算机科学课程节选

For about nine hours a day, I would be in these acting classes,

每天我都要上差不多九个小时的表演课，

纽约的人们 - SpeakingMax英语口语达人