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On the basement of conventional direct fan-beam reconstruction, this paper gives a newly improved algorithm-"fast filtering-backprojection". This method utilizes the symmetrical circle geometry to sample projection data, and reconstructs image on the Polarcoordinate firstly, then translates this reconstructed image onto the cartesian coordinate system with two interpolating operations so that the computer can show the result image on the VGA screen. This algorithm rebates the calculating backprojection greatly, and shortens a few times of reconstructing time than same kinds of means. With the size of image enlarging, the reconstructing time abates with 2 exponent times. In addition, according to the idea of parallel-beam, we rearrange the fan-beams and reconstruct image using parallel-beam method fastly. The rearranging constraint condition is given here.

本文首先在传统的扇束直接重建方法的基础上，提出了一个改进的快速滤波反投影重建算法，它利用旋转采集投影数据的圆周对称的几何关系，先在极坐标系统内进行图象的重建，然后通过两次内插运算再将图象转换到计算机显示方式下的笛卡尔坐标系中去，该方法将以往的直接重建方法中的反投影时所需的运算大大降低，并将重建时间比同类方法缩短了几倍，而且随着重建图象的尺寸的增大，重建时间以2的指数次方倍相对缩短，并获得了较好质量的重建图象；另外，又根据平行束投影重建图象的思想，对扇形射束进行了重排，然后利用平行束重建图象的方法进行扇束的重建，并推导了&扇束重排重建图象&方法的约束条件。

First, in the time domain, we compare distribution and difference of strength of shock wave with differnet wavelength near the focusing.

首先，先在时间域上，比较同波长的震波，在焦点上的强u分布和差。

They are outstanding among the apostles, and they were in Christ before I was.

他们在使徒中是有名望的、也是比我先在基督里。

Increased means and increased leisure are the two civilizers of man .Efficiency is concerned with doing things right .Effectiveness is doing the right things .To think too long about doing a thing often becomes its undoing .

谁能搞点语法，句法方面的东东在里面啊，我很欠缺这方面的知识，越详细的越好哈，我先在此些过了哈，等我能用英语组句的时候我再用英语感谢各位哈！

Start by covering the floor with a plastic sheet, then place old cloths or newspaper on top.

先在水晶灯下的地面铺上胶袋，再在上面铺布或报纸，以作吸水之用。

On the next rung up the ladder of difficult mathematics comes doing the same thing in four-dimensional space.

在这个困难的数学阶梯上取得下一个进展之前，得先在四维空间做同样的事情。

All-Flash website and the production of similar html website, prior should be painted on paper restructuring plan, including : Terms of the theme, with what kind of elements, which elements need to repeat them use elements of the link between how elements of campaign what style of music, the entire site can be divided into several logic blocks, each logic block the link between how and whether you intend to use Flash construct the station or just doing their part of the preliminary site etc., should be considered within the scope.

制作全Flash网站和制作html网站类似，事先应先在纸上画出结构关系图，包括：网站的主题、要用什么样的元素、哪些元素需要重复使用、元素之间的联系、元素如何运动、用什么风格的音乐、整个网站可以分成几个逻辑块、各个逻辑块间的联系如何、以及你是否打算用Flash建构全站或是只用其做网站的前期部分等等，都应在考虑范围之内。

A CEVd strain was isolated from Heibei province in China and its complete nucleotide sequences were identified.Accounting to the characteristic of structure of viroid, the nucleic acid from the positive material was detected by bidirectional PAGE.

柑桔裂皮类病毒快速检测技术体系的建立聚丙烯酰胺双向凝胶电泳法检测：将从阳性材料上提取的类病毒核酸，先在6％的聚丙烯酰胺非变性胶上进行第一向电泳，然后切割含类病毒分子的胶条，在变性条件下进行垂直或反向电泳，最后银染观察。

Run their timings on your system before you accept their conclusions.

在你接受他们的结论之前，最好先在你的系统中运行一下他们的计时程序。

He was more ruthless: the same afternoon, he filed for divorce in France, one of the stingiest jurisdictions in Europe for the non-earning spouse and where adultery affects the court's ruling.

他却更是无情，当天下午就在法国递交了离婚申请。法国法庭对待离婚案中无收入一方，以及过错方可谓苛刻之至。但如果女方先在英国提起诉讼，。

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。