暴雨影响系统的二次分类，使暴雨系统的概念更清晰，对进一步研究暴雨系统提供了科学依据；
The second class of influence system of heavy rainfall can make the concepts of heavy rainfall system more clear and it has denotative meaning to the further study of heavy rainfall system ;
第二次遍历使用与前一个例子十分类似的分组逻辑创建了一个两层结构：chapter和section。
The second pass USES grouping logic much like the previous example to create two levels of structure: chapter and section.
本文给出在中国分类之下二次微分系统有中心时两种情况的通积分。
We give general integral of quadratic differential system with center in two cases under the Chinese classification.
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