电刷和滑环部分应作好绝缘工作,以免出现危险。
Plastic can also insulate from heat and electricity, and when it's really cold, plastic won't stick to your hand like a piece of metal does.塑料也可以隔绝热量和电力,当它真的冷,塑料不会坚持你的手就像一块金属没有。
Is there any way we can insulate our home from the noise?有什么办法能使我们家隔音吗?