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The chattering mode in the dynamic process of the unforced switched systems isinvestigated. The relations between the rotation directions of trajectory, the increase ordecrease the polar radius of trajectory, and the convergent chattering mode are revealed.

分析了二阶切换线性系统的收敛震颤现象与相轨迹的旋向以及相轨迹极半径增减趋势之间的关系，进而得到忽略切换延迟时二阶切换线性系统出现收敛震颤模态的充分条件。

Finally, the future research directions of atmospheric pollen are discussed.

通过分析空气花粉研究的进展对未来该领域的研究工作进行了展望。

The different synthesis methods of hyperbranched polyurethane are reviewed and the research directions of its application are also presented.

本文详尽分析了超支化聚氨酯的不同合成方法，并指出了超支化聚氨酯应用研究的主要方向。

This is basically a Pong game in 4 directions.

这基本上是一个在4个方向乒乓球比赛。

The Pontryagin maximum principle is used to obtain the directions and the switch function of optimal thrusts.

基于C-W方程，提出了用Lagrange乘子法计算最优推力作用时刻和推力的大小及方向的方法。

With its unique design, its facade architecture and its height of 46 metres, the new Port Authority will be an iconic building, visible from many different directions.

由于其独特的设计，其外观建筑和其高度为46米，新的港口管理局将是一个标志性建筑，看到许多不同的方向。

PIERRE, on returning to Gorky from seeing Prince Andrey, gave directions to his postillion to have horses ready and to call him early next morning, and promptly fell fast asleep in the corner behind a screen which Boris had put at his disposal.

皮埃尔从安德烈公爵那儿回到戈尔基，命令马夫把马备好，明天一早叫醒他，然后就在鲍里斯让给他的间壁的一个角落里睡着了。

Finally this survey summarizes the research significance, theoretical significance, potential application and future research directions on the online social networks.

最后总结了在线社会网络的研究意义、理论价值、潜在的应用和未来的研究方向。

In recent years attempts have been made to reform the prayer Book in two opposite directions.

在近几年的尝试已取得了改革的祈祷书，在两个相反的方向。

One of the benefits of the prayer wheel is that it embodies all the actions of the Buddhas and Bodhisattvas of the 10 directions.

转经轮的利益之一是：它是十方一切诸佛、菩萨事业的化现。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。