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

为使旧建筑更节能，木材很好的绝缘。

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。

President Trump, I think, is an equal opportunity insulter.

我认为，特朗普总统一个机会均等的绝缘。

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

事实证明，杜仲胶海底电缆的绝佳绝缘。

Powdery or soft, the substance provides an excellent source of insulation.

粉末状或柔软的物质能成为绝好的绝缘。

Aerogels are great for insulation, because the air inside doesn't transfer heat very well.

气凝胶绝佳的绝缘，因为其内部气不太能导热。

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

而在橡胶一类的绝缘中，电子实际上根本无法流动。

Your body creates its own warm bubble of air just above the skin thanks to conduction.

由于传导，你的身会在皮肤上方产生热气绝缘。

Myelin acts like insulation, just like on an electrical wire that helps the impulse travel more quickly.

髓鞘就像绝缘，就像电线一样，帮助脉冲更快地传播。

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

大部材料都一个绝缘，但其表面仍可带一支电流。

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

一个拓扑绝缘就像两个同时起作用，而在过去被我们认为不可能的。

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的概念比较熟悉？

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。

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

另一方面，绝缘的电子难以获得足够的能量去摆脱束缚进行流动。

One example is called a topological insulator.

一个例子叫做拓扑绝缘。

They're also good insulators for heat and electricity.

它们也热和电的良好绝缘。

Her nose looked like a porcelain insulator.

她的鼻子看起来像瓷绝缘。

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

在橡胶等绝缘中，电子根本无法流动。

Copper conductors are  surrounded with many layers of paper insulation.

铜导周围有多层纸绝缘。

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

我们营相当数量的瓷砖，以及电器用品的绝缘。但厨房用具和餐具本公司主要系列产品。