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By the use of Circling cluster and Envlopment theory and flat surface sit-mark transformation theory, the chain wheel tooth equation of roller chain at high speed to match conjugage engagement is deduced.Establishing chain speed equation of roller chain at high speed,based on the analysis of the speed curves between roller chain at high speed and common roller chain,good drive of roller chain at high speed is verificated theoretically.By a example that move distance from transverse vibration between roller chain at high speed and common roller chain is contrasted,the accuracy of those theories that the paper brings up and higher functions of roller chain at high speed is proved.Finally, Establishing conjugage engagement line equation of roller chain at high speed and analyzing the complete engagement zone, the chain wheel tooth curve equation is studied at a higher degree. At the same time,the lack's place of the research result is pointed out.

依据高速滚子链设计要求与H_y-V_0齿形链的研究，阐述了滚子链传动实现准共轭啮合理论可能性；利用圆族包络法结合平面坐标变换理论推导出了满足共轭啮合的高速滚子链的链轮齿廓曲线；建立起高速滚子链链速方程，通过对高速滚子链与普通滚子链链速曲线的对比分析，从理论上验证了高速滚子链具有良好的传动性能；最后，建立起高速滚子链共轭啮合线方程，对其整个啮合区间进行了分析，进一步研究了链轮齿廓曲线方程，确定了主要参数的设计方法的问题，并同时指出了不足之处。

I hardly knew what school was ,but i nodded.nothing more was said .but one january morning ,a few weeks later ,i saw a carriage coming up the drive .bessie scrubbed檫洗］ my face and hands and brushed ［梳］my hair roughly .then she told me to go downstairs.i stood in the hall ,trembling .what a miserable creature i had become because i always afraid!

我几乎没有听说过学校为何物，但还是点了点头。什么也没有说。几个星期以后，1月份的一个早上，我看到一辆马车从路上驶来。贝西给我擦了擦脸和手，又给我粗粗地梳了梳头，然后叫我下楼。我站在大厅里，颤抖着。我老是害怕，已经变成一个可怜兮兮的人。

What to do in a place like this- You can swim, surf, dive, sail, golf, play ball, ride, explore, bargain hunt, sight see, explore, or drive a dune buggy for 100 miles in any direction, take a jeep up a steep mountain trail.

怎样做一个这样的地方--你可以游泳、冲浪、潜水、风帆、高尔夫、打球、骑、探索、亨特讨价还价，看到的景象，探索，或径为100英里的沙丘派上外太空任何方向一辆吉普车采取了陡峭山步道。

On the one hand, science and technology extremely strengthens the power of human, and market economy realizes the constant growth of social material wealth, on the other hand, with ideology of scientific rationalism and economic determinism, people deviate from the basic moral spirit and humanistic value. The absence of responsibility brings hidden worry to both present and future existence and harmonious development of human. In the drive of economical globalization, Chinas reform and opening-up gains tremendous fruit, however, the ecological and moral problems gradually emerge.

一方面，科学技术的发展极大增强了人类的力量，市场经济使社会物质财富不断增长：另一方面，在科技理性和唯经济主义的意识形态下，人们背离了人之为人应有的道德精神和人文价值，责任缺失给人类当下和未来的生存与和谐发展带来极大隐忧。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。