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.
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.
“你们这些毛小子在这里干什么呢？”他喊道，我的朋友们立刻作鸟兽散，还没来得及吃掉的树莓被扔得四处乱飞。
"What you boys doing out here?" he shouted as my friends scrambled [4] off in all directions, uneaten raspberries flying every which way.
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