英语语法分析

Condensation occurs when the supersaturation is positive.

当过饱和是正值时，则出现凝结。

A drop zero radius would require an infinite supersaturation to maintain it.

要使一个半径为零的液滴保持下去将需要无限大的过饱和度。

The supersaturation used is too low to produce an appreciable rate of nucleation.

所用的过饱和度太低，不能产生一个值得重视的成核率。