That's because they contain numerous layers of insulation and heavy protective fabric.

那是因为舱外航天服含有多层隔热材料和厚重的防护织物。

White matter refers to connections that are myelinated, coated in a layer of insulation, allowing for fast far-range communication between information hubs.

白质指的是有髓鞘的神经纤维，由一层保护层包裹，保证了信息中心之间的远距离快速交流。

Frequently used neuronal pathways are myelinated, wrapped in a layer of insulation, allowing information to travel faster.

经常使用的神经通路是有髓鞘的，包裹在一层绝缘层中，使信息能够更快地传播。

And you'll definitely want a good layer of insulation to keep heat from leaking into the ground - because you're going to need a lot of heat!

你肯定想要一个好的隔热层来防止热量泄露到地面—因为你将需要大量的高温！