Actually, what that would say, and we are going to see more about that so not very important right now, but what we would see is that for a close surface we would end up getting zero for the flux.
也就是这样了，现在来看点没那么重要的东西，对于一个封闭的曲面，如果通量为零。
2
Flux is going to be zero because nothing passes through the surface.
通量之所以为零，是因为根本没有东西通过曲面。
3
It's not clear why this extrapolation was used or what conclusions can be drawn from it; the molecular surface tension could just as easily be asymptotic with respect to the zero point.