要注意的是，散度并不是只在圆心处是。

But, actually, divergence is not two just at the origin.

youdao

如果每点处取负的向量的话，就会得到负的散度了。

If you took the opposite vector field that contracts everything to the origin that will have negative divergence.

youdao

英国早期的盎格鲁萨克逊居民，在原野上四处探勘观察、漫游和开垦，为各地形的起起伏伏精确地命名，然而这些微妙的立意，却在现代机动化的英国散轶。

Early Anglo-Saxon settlers in England, observing, walking and working the landscape, defined its ups and downs with a subtlety largely missing from modern, motorised English.

youdao