This is a story about mechanical objects, -- some of which move-- -- remember those smiling houses in the background-- and some of which are stationary, but they're all mechanical objects.

这是一个关于会活动的，机械的故事-,还记得那些作为背景微笑的房子吗？,它们不会动但也都是机械的东西。

耶鲁公开课 - 文学理论导论课程节选

So, that's the kind of stuff: a little bit of background about myself. So now, 1 let's talk about the perspective of 3.091 All of this will be posted. You can take notes.

就是这些事情，我自己的,一点背景介绍，现在，我们谈谈这门课程的远景1,这些都会放到网站上去，你们可以记笔记。

麻省理工公开课 - 固态化学导论课程节选

All right. With that by the way of background, let's go on to two -what we might call rhythmic devices here--two rhythmic devices.

以此为背景知识,我们来继续学习,两种节奏类型

耶鲁公开课 - 聆听音乐课程节选

So the library books are all optional background.

所以图书馆内的书,都是可供选择的背景资料

耶鲁公开课 - 金融市场课程节选