这个书包是有人下课后落下的。

This bag was left behind after the class.

《牛津词典》

下课后，老师拿起所有学生的答题纸，读了答案。

At the end of the class, the teacher took all the students' answer sheets and read the answers.

youdao

下课后，一个小女孩走到我面前，问我：“你能帮我读一下这个吗？”她带着我见过的最兴奋的表情，好像她刚刚得到了一块饼干。

After class, a little girl walked up to me and asked, "Could you help me to read this?" with the most excited face I have ever seen as if she had just gotten a cookie.

youdao

Second, well we're not getting to the second one; let's see what-- okay as I mentioned the lecture slides will be posted almost always the same day after the class.

第二点我们暂时不谈,课程的课件会放在网站上,通常是那一天下课后

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选