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Utilizing the tools of conformal mapping and Cauchy integral formula and so on, the SIFs at the crack tips are obtained, which can be reduced to the known results under the condition of limitation; For the third and the fourth section, the problems of arc crack and parabolic crack are researched in one dimensional hexagonal QCs.

第二节研究了一维六方准晶狭长体中双半无限共线裂纹问题，利用保角变换以及Cauchy积分公式等工具求得了裂尖处的应力强度因子，在极限的情况下可以还原为若干已有的结果。

Frederick Douglass, a slave, explained this phenomenon when he was employed as a Baltimore ship's caulker: I was to be allowed all my time; to make bargains for work; to find my own employment, and to collect my own wages; and in return for this liberty, I was … to pay him (Douglass' master) three dollars at the end of each week, and to board and clothe myself, and buy my own caulking tools.

"冯检道格拉斯，一个奴隶，解释这一现象时，他被聘用为巴尔的摩船舶的caulker ："我是为了让我所有的时间；作出讨价还价的工作；找到自己的就业，并收集我自己的工资；并在返回这个自由，我是……以他的薪水 3美元，上月底，每星期和董事会和衣物自己，购买自己的嵌缝工具。

A thumb-thick electric cautery pen, a piece of tile-sized wooden cabinet, which is pyrograph Shubin of the use of basic tools.

一支拇指粗的电烙笔，一块瓷砖大小的柜木板，这就是俞彬烙画时使用的基本工具。

Reference tools for CD ROM buyers are provided.

最后介绍了选择国内外光盘产品的参考工具。

The production of cement mixer (ancillary products export to the United States), machine tools to force into the SBS-oriented products.

以生产水泥搅拌机、机床动力进给器SBS为主导产品。

Arab drink coffee leisurely and they also have some daintily way, just like the Chinese people have teas, they also light cense and also put some flavor when they drinking coffee. And the myriads of coffee tools are full of expression of Arabian nights.

阿拉伯人喝咖啡，喝得慢条斯理，它们甚至还有一套讲究的咖啡道，就如同中国茶道一样，喝咖啡时不但要焚香，还要撒香料、闻香，琳琅满目的咖啡壶具，更充满着天方夜谭式的风情。

Two key tools: the law of large numbers, and the central limit theorem.

两个重要工具：大数定律，中心极限定理

Central office for operation and management of project tools, such as enterprise-wide project management software

使用与管理项目工具，如全组织项目管理软件的集中场所

The traditional methods such as morphology and ecology have provided basic tools for identifying the cephalopod structure, in which the way based on statolith aging has become important.

分析认为，头足类种群结构的研究在世界范围内已经取得了很大的进展，传统的形态学和生态学方法为其鉴定提供了基本的手段，其中利用耳石对其生长和产卵季节等进行推算是当前研究的主要手段之一。

As ceramics enterprises, machinery and equipment are the most basic tools of production.

作为陶瓷企业，机械和设备的生产最基本的工具。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。