As thermos flasks demonstrate , a vacuum is a great insulator .
如同热水瓶所显示的那样，真空是极好的绝缘体。
A capacitor , super or otherwise , is made of two conductors separated by an insulator .
电容器，超级的也好，一般的也好，都是由绝缘体分开的两个导体组成。
A traditional capacitor stores electricity as static charges , positive and negative , on two electrodes that are separated by an insulator .
一个传统的电容器以在正负电极间夹着绝缘体并且两端分布静电荷的方式储存电流。
With a decent covering of fur , this would fluff up the coat , getting more air into it , making it a better insulator .
如果表面覆盖着大量毛发，鸡皮疙瘩会让表皮变得稀松，以便更多的空气进入，使表皮变成更好的绝缘体。
The air inside the bottles serves as a natural insulator and the film can be laced with light-emitting diodes , or leds , to provide low-cost lighting .
