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The paper induces and analyzes research method of the tooth, including Method line of the tooth theory,Envlopment theory, Camus theory, Circling cluster theory and so on.Based on the past theories,the new measure to deduce the chain wheel tooth equation of roller chain at high speed,Circling cluster and envlopment theory,is proposed by analyzing basic concept of equidistant curve and Willis theory.Following the presentation of drawing lessons from traditional roller chainof the change of stanza line distance. A new type of roller chain at high speed is given in the paper.The paper studies deeply structural characteristics, the change of stanza line distance,separation between plank and bore and so on.According to design requst of roller chain at high speed and the study ofH_y--V_0 tooth chain,the impossibility that Quasi-conjugage engagement theory isrealized by the engagement of roller chain at high speed from the aspect of theory is decribed.

作者综述了高速滚子链国内外研究现状，并进行了以下研究工作：归纳分析了齿形法线法理论、包络法理论、卡姆士定理、圆族法理论等齿形研究方法，在此基础上，结合齿形啮合基本定律，分析了等距曲线的基本概念，提出了一种推导高速滚子链链轮齿廓方程的新方法—圆族包络法；在借鉴普通变节距滚子链的基础上，本文提出了一种新型的高速滚子链链条，深入研究了高速滚子链链条结构特性及其变节距、板孔中心分离等特性。

Erma talks with many children with cancer and learns important life lessons from them. She learns, for instance, that cancer survivors know how to laugh.

爱码和许多患上癌症的孩子谈话并且从他们学到了许多人生要义，比如，她懂得了如何从癌症幸存下的人身上学到怎样笑对人生！

Maria Eugenia said...Hi Miragee, you should write "The taiwanese lessons", and illustrate the book with your beautiful drawings.Ciao

灰色兽小妹，我看了你介绍的动画，啊，这位先生真是太有劲了，的确和金山的人潮有异曲同工之妙！

The eugenic practice of Nazis Germany and Lisenko's school up and down in the former Soviet Union left us unforgettable lessons.

纳粹德国的优生实践和前苏联李森科学派的兴衰都给我们留下了不可忘记的教训。

Pritchard is a dedicated teacher of his craft, giving private lessons and master classes on euphonium and trombone as well as tuba.

除了他的表现的时间表，张老师专门为他普里查德器关于赋予私营教训和大师班euphonium长号、大号以及。

In LA recently to promote "Driving Lessons," the candid, colorful Julie was asked if she has been like an Evie to Rupert.

在她最近在洛杉矶宣传《驾驶课》期间，坦率风趣的朱莉被问到她是不是对鲁珀特本人也像影片中的艾维一样。

I believe that all events that take place in my life are lessons designed to help me evolve spiritually.

我相信发生在我的生活中所有的事情都是经验教训，旨在帮助我在精神上得到发展。

Don't forget you can review all of our EW lessons on the web.

别忘了，你可以上网来复习所有我们《英语世界》的课程。

Also please to draw lessons from toward main such person of building once, do not learn this bad egg, blind call here, mother school damage ever, look for person to excoriate.

也请向楼主这样的人借鉴一下，不要学这个混蛋，在这里瞎叫，损毁曾经的母校，找人唾骂。

In His life and lessons, Christ has given a perfect exemplification of the unselfish ministry which has its origin in God.

在他的生活和教言中，基督给人以无私服务的榜样，是发源于上帝的。

I can not negligent, he should do what?

我不能不在意了，他要做什么呢？

It is very dangerous to swim in the river alone.

一个人到河里游泳是很危险的。