You need a substance and then that substance has to have a property that changes depending on the heat flow, i.e., depending on whether it's sensing that it's the same temperature or different temperature than something else.

你需要某种物质,它的某种性质,随着热量的流动而改变，也就是说,依赖于它是否感觉到它,与其他的物体处于相同的温度。

麻省理工公开课 - 热力学与动力学课程节选

It's always a little bit cheaper. So, the same thing with e-books.

总是便宜一点。所以，对于电子书也是一样。

音乐市场的变化 - SpeakingMax英语口语达人

Otherwise, you know, TAs get ten e-mails, all with the same question.

否则就是助教的邮箱收到10封邮件,都问的是同一个问题

耶鲁公开课 - 基础物理课程节选

No.He just keeps that same E-flat chord for about six minutes at the beginning of the Overture to Rheingold, and on the basis of that you know there's going to be a very long opera.

没有莱茵的黄金序曲的前6分钟全部是E大调和弦，由此可见这是一部非常长的歌剧。

耶鲁公开课 - 聆听音乐课程节选