More specifics about using Gauss's law.

有关使用高斯定律的更多细节。

And, what we have just shown here is a demonstration of Gauss's law.

而且，我们刚刚展示的是高斯定律的证明。

Now, Maxwell's third equation doesn't have anything to do with Gauss's Law.

但在这里，对于闭合曲面，积分并不总是等于 0。