That's a mouthful, but it's what's happening on the microscale.

很大的变化，发生在微观度上的事情。

And computational models that resolve all of these scales, from the microscale all the way up to the system level, are computationally intractable.

解决所有些度（从微观度一直到系统级别）的计算模型在计算上非常困难。