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In the forth chapter, betulin was oxidized by Jones oxidation in step 1 and converted to betulonic acid, then betulonic acid was reduced by sodium borohydride in step 2 and converted to betulinic acid.

第四章使用琼氏氧化剂氧化白桦酯醇，硼氢化钠还原制得白桦酯酸。

The electrochemical studies showed that DNA can be adsorbed and desorbed reversely onto nano-sized zirconia, as 2, 2'-bipyridyl was added gradually into the probe solution with low ion strength the peak current of probe molecule decreased step by step.

与钙离子相比，在同样条件下镧系离子能更加显著的提高DNA的电子转移速率常数。1、用化学和电化学方法研制成了一种组成为KnH〓O的修饰材料。

Then the lift and torque models of double wings fin stabilizers flapped lengthways and single wing fin stabilizers flapped breadthwise at zero speed are acquired on the basis of step by step degenerate derivation.

根据Weis-Fogh机构的组成和结构特点，论文提出了双翼纵向拍动型、单翼纵向拍动型和单翼横向拍动型三种类型的零航速减摇鳍。

Back to ancient water, and go along the road, book, five bulbophyllum paved path, tortuous, isn't that was winding horseshoe step by step, the grinding travel light tea-horse road?

重回古城，临水而做，沿路而走，怀古幽思，五花石铺成的小径，曲折蜿蜒，那不是当年被马蹄踏磨，被商旅者踩亮的茶马古道吗？

The invention relates to a processing method of preventing frostbite and restarting of hydrogen electric pile, whose characteristic lies in the treating processes includes: When the electric pile turns off, the unsaturated fuel gas or the nitrogen, through the circle boast to clean the dissociate water; drying the MEA film module to keep the water content below the stipulated temperature which does not ice up; then the recycle gas through a wet exchanger to dry and the dried gas is continue used in the dry pile step; when restarting the electric pile, the recycle gas must heats then through the pile to elevate the temperature, then heats the fuel gas and the oxidant of the gas source, through the weting of the wet exchanger enters to the calefactive pile, enhances the wet step of the film module in the pile, starts the power output of the pile.

本发明涉及一种氢电堆的防冻和重新启动时的处理方法，其特征在于处理过程包括：电堆停机时，将水蒸气不饱和的燃料气体或氮气，通过循环吹扫除去电堆的游离水；干燥其中的MEA膜组件，使膜组件含水量降低到规定低温下不结冰的程度；而后再令循环气体通过一个湿交换机将循环气体干燥，以及被干燥后的循环气体继续用来干燥电堆的步骤；在电堆重新启动时，须将循环气体加热后通过电堆，使电堆升温，然后再将气源的燃料气及氧化剂加热，通过湿交换机加湿后进入已升温的电堆，提高电堆中膜组件的湿度的步骤，开始电堆的功率输出。

Altogether there are seven chapters in this article. Chapter one starts with the historical background caused by the occurrence of the concept of sexual harassing and analyzes the reasons of sexual discrimination which is brought forward by Catharine A Mackinnon when defining the concept of sexual discrimination. Meanwhile, she analyzes the employers' responsibilitiy which appears to be another feature , has a brief presentation on the gradually widened connotation and denotation extension of the American law and a step- by- step-built anti-sexual harassing law system that is learned from by most of the countries. This chapter helps us to have a general understanding of the overseas anti-sexual harassing law system represented by America. Chapter two is about the analysis of the phenomenon of the Chinese sexual harassing. Before the first sexual harassing case appeared in 2001, it doesn't belong to the concept of law.

第一章从性骚扰概念产生的历史背景入手，分析了麦金侬提出性骚扰概念时将性骚扰定性为性别歧视的原因，对性骚扰概念另一特色雇主责任进行了分析，并简述了美国法律通过不断扩大性骚扰概念的内涵和外延，逐步建立起一套符合本国国情并为世界大多数国家所仿效的反性骚扰法律体系，该章使我们对以美国为代表的国外反性骚扰法律体系有一个全面的了解。

Altogether there are seven chapters in this article. Chapter one starts with the historical background caused by the occurrence of the concept of sexual harassing and analyzes the reasons of sexual discrimination which is brought forward by Catharine A Mackinnon when defining the concept of sexual discrimination. Meanwhile, she analyzes the employers' responsibilitiy which appears to be another feature , has a brief presentation on the gradually widened connotation and denotation extension of the American law and a step- by- step-built anti-sexual harassing law system that is learned from by most of the countries.

第一章从性骚扰概念产生的历史背景入手，分析了麦金侬提出性骚扰概念时将性骚扰定性为性别歧视的原因，对性骚扰概念另一特色雇主责任进行了分析，并简述了美国法律通过不断扩大性骚扰

Comclusion: transpetrous presigmoid retrolabrinth approach was rational approach for surgery on petroclivus and -4- CPA; it抯 important for accomplish the surgery to study and master the anatomy and variance of this approach; there was relative anatomical relationship among those structure on posterior of petrous bone; AAMP was the extracranial mark of inflexion of TS and SS; LAM and PSC were obvious bone marks for operation; we can confirm the abraded range of petrous bone lean upon LAM and/or GSS beside abrading step by step as literature, and it抯 unnecessary and unrational to emphasize to show PSC if the surgical space was enough; preceding sigmoid sinus and high jugular bulb often appeared at right and would bring disadvantage effect; interspace ,between CN V and CNVII or CNVII and CNJXI, were available to reach clivus and manage the mass on the range.

经SS前迷路后入路是处理岩斜坡区、桥小脑角区病变理想的手术入路；研究和熟悉手术入路中的解剖结构及部分变异对指导手术十分必要；岩骨内测面的骨性结构之间有着相对稳定的空间关系；顶乳缝前角是SS和TS转接处在颅外的标志；IAM和PSC等结构可以作为手术中的重要骨性标志；以PSC确定岩骨的磨除范围是较安全和可靠的，但亦可以结合影像检查，以内耳道和乙状窦前缘为基点判定切除范围，如果操作空间足够，过分强调磨出半规管是不适当的；右侧GSS的宽度和深度较对侧大，SS前置和颈静脉球高位较对侧多见，这些都对右侧入路有不利的影响，但仍可以进行手术操作；三叉神经和面神经间隙及面l 神经和舌咽神经间隙方便到达斜坡并处理病变。l

I've been using the One Step face base for about 3 years I love the coverage it gives without it looking heavy and cloggy and although I'm 50+ I have had compliments about my complexion, while wearing One Step face base I must stress.

我已经使用这款一部到位粉底将近有三年的历史了。我喜欢它的妆容，一点都不显得厚重。我已经50岁了，可是我得强调一点是，当我用上一部到位粉底时，我仍然可以听到别人对我的脸进行赞美的话语。

If we can really see a problem, which is the first step, we come to the se cond step: cutting through the complexity to find a solution.

就算我们真正发现了问题所在，也不过是迈出了第一步，接着还有第二步：那就是从复杂的事件中找到解决办法。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。