不是简单地试图打败对方或者建一个新纪录，许多极限运动是展现美，和谐和刺激的。
Instead of simply trying to defeat the other team or set a new record, many extreme sports are about beauty, harmony and thrills.
然而现在，靠巨额赞助合同的支持，许多极限运动员也是在金钱的驱使下而参赛并把他们自己看成了打完。
But now, many of the extremists, propped up by huge sponsorship contracts, are just as dollar-driven and take themselves just as seriously.
本文研究了平面多项式向量场的全局与局部分叉，旨在研究高次平面非线性动力系统多极限环的存在性以及极限环的个数及其相对位置关系；
The main aim of this dissertation is to study the exist of limit cycles of plane nonlinear dynamic system of high degree and the number and the configurations of limit cycles.
本文研究了平面多项式向量场的全局与局部分叉，旨在研究高次平面非线性动力系统多极限环的存在性以及极限环的个数及其相对位置关系；
The main aim of this dissertation is to study the exist of limit cycles of plane nonlinear dynamic system of high degree and the number and the configurations of limit cycles.
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