The cryoprotectant is basically a medical-grade anti-freeze, if you like.

如果您愿意， 基本上是一种医级防。

The cryonicists then try to replace some of the body's water with a cryoprotectant, which basically acts like human antifreeze.

然后，人专家尝试一种代替人的部分水分，这种的作基本上类似于人防。