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Secondly, a conjecture about the stability for these systems is proposed based on the sufficient and necessary condition of the isolated transfer function being positive real. When the zeros and poles of the transfer functions lie in the imaginary axis, a known conclusion is derived from the conjecture; while the zeros and poles are on the real axis, a new result is obtained and is proved in this note. Finally, according to the conjecture, an example with poles existing on the complex plane is presented, which is not only interesting but also challenging.

然后， 基于所有孤立部分传递函数都正实的充分必要条件给出了上述系统为稳定的一个猜想，当传递函数的零极点都位于虚轴上时，由这一猜想得到了一个已知的结论；当传递函数的零极点都位于实轴上时，由这一猜想得到了一个新的结论，本文证明该结论是正确的；最后，根据这一猜想，给出了传递函数极点位于复平面的一个例子，它涉及到一类系数矩阵为时变正定矩阵的振动方程的稳定性问题，值得去深入研究。

You are choosing roads and at the same t ime challenging your own choices.

你们正在选择人生的道路，同时也在对自己的选择提出质疑。

Although I grew up in very modest and challenging circumstances, I consider my life to be immeasurably rich.

虽然我的成长环境不甚优越、奋斗历程充满坎坷，但是我依然认为我的生活无限富足。

ABSTRACT Real-Time Systems being in urgent need imminently is a challenging discipline.

需求迫切的实时系统是一个挑战性的学科。

Imperium Romanum is a challenging, enjoyable, and authentic quest to rule the world.

统治romanum是一项具有挑战性的，愉快的，和真实的追求，以统治世界。

Implicit function based surface reconstruction has been a challenging work for decades in computer graphics field.

通过隐函数拟合实现曲面重建是计算机图形学领域中一项重要而有挑战性的工作。

Evaluation of the heterogeneity is a significant and challenging work in the molecular imprinting research field.

对识别位点的均一性的评价成为印迹技术研究的重要内容之一。

Face recognition is one of most challenging problems in the fields of pattern recognition and machine vision.

人脸识别技术是模式识别和机器视觉领域最富挑战性的研究课题之一，也是近来研究的一个热点问题。

This is very challenging but with proper care, this will surely save money in the long term.

这是非常具有挑战性的，但适当的照顾，这必将省钱长期的。

In this paper In order to found the healthy academic evaluation system for digging innovation and provide the academia for challenging the Nobel prize, the outboard evaluation system, the inboard blocking innovation factor and the actual paper evaluation system are analyzed.

为了建立健全我国挖掘创新的学术评价体制，从而为冲击诺贝尔奖提供学术环境，分析了外国的评价体制，分析了我国阻碍创新的因素，分析了论文评审现行制度的弊端。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网