One of the kids came back with it all written on the back of the paper.

其中一个孩子在纸的背面完成了作业,并带回了教室。

麻省理工公开课 - 媒体、教育、市场课程节选

At the back of the book--I think I took mine out but at the back of the book you will see wrapped with it an intro CD, introductory CD.

在书的背面,我的这本已经没了,但在书的后面,你会看到,有一个包装好的CD,里面是相关简介

耶鲁公开课 - 聆听音乐课程节选