And for retrofitting older buildings to be more energy effcient, wood is a good insulator.

为使旧建筑更节能，木材是很好的绝缘体。

Since these are not connected to each other, the result is an insulator.

它们彼此之间互不连接，因此成为了绝缘体。

It also turned out that gutta percha was a great insulator for undersea cables.

事实证明，杜仲胶是海底电缆的绝佳绝缘体。

And since asphalt is an insulator, it traps that heat over the course of the day.

因为沥青绝缘，昼捕热。

Most of the material is an insulator, but its surface can carry an electric current.

大部分这种材料都是一个绝缘体，但其表面仍可带一支电流。

The Earth's crust is an incredible insulator, and it keeps this massive, inexhaustible heat source beneath us invisible.

地壳的隔热效果很棒，能让这个巨大、用之不竭的地底热能来源不被注意到。

A topological insulator acts like both at the same time, which we used to think was impossible!

一个拓扑绝缘体就像两个同时起作用，而这在过去被我们认为是不可能的。

All right, let's begin. Show of hands, who here is familiar with the concept of topological insulators?

好吧 开始上课 请举手告诉我 在座的哪位对拓扑绝缘体的概念比较熟悉？

And in an insulator, like rubber, electrons can't really flow at all.

而在橡胶一类的绝缘体中，电子实际上根本无法流动。

Someone douses the fire, and she lowers the pot into an insulator they made out of clay and straw.

有人把火弄熄，她把锅子放到他们自己做的保温器里头，是用泥土和草做成的。