经过一个艰难的周末，车队终于收获了赛季的首次积分。
After a difficult weekend, the first points are a small reward for all our team members.
利用奇点和有限集的特征，给出了首次积分存在的某些条件。
Some conditions on the existence of the first integral are given via the properties of equilibria and limit sets.
本文主要用首次积分法构造一阶拟线性偏微分方程始值问题的解。
The fist integration is mainly used tO form the initial value solution of fist order quasi-linear partial differential equation.
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