The conditions of Theorems 1 and 2 formulated here adopt the Liapunov functions with parameter so that they may be more easily obtained by using Chetaev 's method.
其中定理1和2的条件采用带参数的函数，便于运用由方程首次积分构造函数的方法来获得。
Conditions for permanence is established via the method of comparison involving multiple Liapunov functions.
进而，利用李雅普·诺夫函数和比较定理确定了持续生存的条件。
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