Now, the reason we were able to come up with this is two key ideas: One is that this is similar to a cryogenic Dewar, something you'd keep liquid nitrogen or liquid helium in.
我们能够想到这样的方法 主要是因为两点 首先这与低温真空瓶的原理相似 你可以把液态氮或液态氦放在里面。