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。

I've always found it interesting that snow, which is literally frozen water, is such a great insulator that structures made of it can keep you warm.

我一直觉得下雪很有趣，虽然其实就是结冰的水，这是一种很好的隔热材料，用它制成的结构可以保暖。

That tightly-packed ground snow is dense enough to hold up, but because it still has far more air pockets than a block of ice, it's light, and still a pretty good insulator.

地上的雪非常紧密，可以被拿起来，但其中的空气还是比冰内含有的空气更多，比较轻便，仍然是个好的保温材料。

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

它们彼此之连接，因此成为了绝缘体。

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

而橡胶一类的绝缘体中，电子实际上根本法流动。

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。

The high-definition zoom lens mounted on the device captured images of key grid components, such as insulators, and transmitted them in real-time to a platform.

安备上的高清变焦镜头捕捉绝缘体等关键电网组件的图像，并将其实时传输到平台。

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。

We do a fair amount in tiles and in insulators for electrica appliances. But kitchenware and tableware are our mainlines.

我们经营相当数量的瓷砖，以及电器用品的绝缘体。但是厨房用具和餐具是本公司主要系列产品。

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。

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 座的哪位对拓扑绝缘体的概念比较熟悉？

Each insulator is about six feet and it'll probably cover two doors, so for just a couple bucks, you can take care of all your entryways.

每条绝缘体大约有六英尺长，大概可以用到两个门，所以只要几块美元，就可以处理你的入口通道啦。

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。

At a certain point these bridges transform the developing network from an insulator into a conductor, by letting electrons hop from island to island.

某一时刻，这些桥梁让电子从一个岛屿来到另一个岛屿，将发展中的网络从绝缘体转变为导体。

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、用之竭的地底热能来源被注意到。

This makes it an excellent insulator, but the same way you have to pack it in your hands to make a snowball, it isn't dense enough to build with.

因此，雪花是非常好的保温材料，但如果你想抓一把雪花做一个雪球的话，你会发现做了，因为密度够。

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，而这过去被我们认为是可能的。

Nowadays, scientists are working to develop topological insulators, and some think they could be as important for future technologies as semiconductors are today.

当前，科学家们正致力于研发拓扑绝缘体。其中有些人认为拓扑绝缘体对于未来的技术就像今天的半导体一样重要。

The electrons in insulators, on the other hand, have a tough time getting enough energy to break free and flow.

另一方面，绝缘体的电子难以获得足够的能量去摆脱束缚进行流动。

The effects of high pressure can also work in reverse, causing some metals to lose conductivity or become insulators.

高压也能产生相反的效果，可能会使一些金属失去导电性或变成绝缘体。