The amount of divergence is a subtle affair, liable to perplex the Englishman when he looks at America.

差异的多寡是件极为微妙的事务，这极容易使一个英国人在审视美国时大惑不解。

youdao

So, the divergence itself measures basically the amount of sources or sinks per unit volume in a given place.

散度本身度量了，给定区域的,单位体积内的冒出的，或者流失的量。

youdao

The other way to think about it is divergence is the source rate, it is the amount of fluid that is being inserted into the system, that is being pumped into the system per unit time per unit area.

另外一个理解方法是，散度是源头的“冒出率”，它是流体往系统输入的量，也就是单位时间内，单位面积新冒出的流体。

youdao