在第四章和第五章，分别对一类五次系统和七次系统的无穷远点的中心条件和中心积分进行了完整研究。
In Chapter 4 and Chapter 5, complete researches have been done respectively on the center conditions and center integral of a quintic system and a septic system.
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.
对于层状模型，若采用直接积分的中心差分方法，计算过程十分简单，也可用于有限差分等方法的计算中。
For a layered model the computational procedure for the central difference method of direct integration is very simple and easy.
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