• 1. Positive Divergence: 正背离 | 底背离 | 似乎出现正逆差
• 2. positive vertical divergence: 正垂直偏斜

• 1.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。
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• 2.By using the density theory of theories of Numbers, the article gives the density discrimination method determining the convergence and divergence characteristic of the positive term series.
  借鉴数论方法中的密率论，给出判别正项级数敛散性的密率判别法，此方法特别适用于判定一些较难或不能给出通项表达式的级数的敛散性。
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• 3.The heavy rain is presented under the condition of the strong positive vorticity, convergence, vapor flux convergence in middle and lower troposphere and stronger divergence at upper troposphere.
  大暴雨发生在对流层中低层为气旋性涡旋、流场辐合加强、水汽通量增加、水汽通量辐合加强，并伴有高层较强辐散的情况下。
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