If you took the opposite vector field that contracts everything to the origin that will have negative divergence.
如果每点处取负的向量的话，就会得到负的散度了。
Positive vorticity accumulated by horizontal advection was balanced with negative vorticity made by divergence term in vorticity balance.
涡度平衡中主要是水平平流累积的正涡度与散度项制造的负涡度相平衡。
The empirical results show that the fiscal expenditure not only failed to promote regional economic gap narrowed, but has played a negative role in accelerating regional economic divergence.
本文的实证结果表明，财政支出不仅没有促进区域经济差距的缩小，反而起到了负面作用，加速了区域经济的发散。
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