正位

Third, most magnesium alcoholates are prepared by alcoholysis.The process is based on the exchange of alkoxide groups of a metal alcoholate in the presence of an alcohol other than the alcohol corresponding to the original alkoxide,i.e.on the alcoholysis of a metal alkoxide with a different alcohol. Primary alcoholates can be prepared by this process,such as magnesium di-n-propanolate,magnesium di-n-butanolate,magnesium di-isobutanolate.

该方法适用于较高沸点的伯醇的醇镁化合物，例如正丙醇镁、正丁醇镁、异丁醇镁等，但是用醇解法制备出的叔丁醇镁，其纯度只有80％，这是由于叔丁醇具有较大的空间位阻效应，阻碍了醇交换的进一步进行，并且叔丁醇沸点与甲醇相差不大，使得甲醇难以快速蒸出，只能得到一种混合醇盐产物。

Third, most magnesium alcoholates are prepared by alcoholysis.The process is based on the exchange of alkoxide groups of a metal alcoholate in the presence of an alcohol other than the alcohol corresponding to the original alkoxide,i.e.on the alcoho- lysis of a metal alkoxide with a different alcohol. Primary alcoholates can be prepare- d by this process,such as magnesium di-n-propanolate,magnesium di-n-butanolate,m- agnesium di-isobutanolate.

该方法适用于较高沸点的伯醇的醇镁化合物，例如正丙醇镁、正丁醇镁、异丁醇镁等，但是用醇解法制备出的叔丁醇镁，其纯度只有80％，这是由于叔丁醇具有较大的空间位阻效应，阻碍了醇交换的进一步进行，并且叔丁醇沸点与甲醇相差不大，使得甲醇难以快速蒸出，只能得到一种混合醇盐产物。

The position of controlled structure was positively fed back to controller according to position measure and contraposition control, and position of controller was positively fed back to control structure to control the vibration of controlled structure.

将实际系统模型放置在仿真系统中进行半实物仿真控制。通过位置测量、对位控制，将受控结构位置正馈至控制器，再将控制器位置正馈给控制结构，控制受控结构的振动。

By the case of skewed cavity flow with 30-degree angle, the convergence performance of SIMPLE/SIMPLEC algorithm was analyzed on unstructured grids and the influence of accepting or rejecting non-orthogonal terms was compared.

利用30°角的斜方腔流动计算成果，分析了非结构同位网格的SIMPLE/SIMPLEC算法的收敛性能；比较了因网格的非正交而引入的非正交项的取舍对该算法收敛性能的影响；并采用显式校正步法对SIMPLEC算法进行了显式校正。

The Pentagon already routinely uses robotic aeroplanes known as unmanned aerial vehicles. In November 2001 two missiles fired from a remote-controlled Predator UAV killed Mohammad Atef, al-Qaeda's chief of military operations and one of Osama bin Laden's most important associates, as he drove his car near Kabul.

目前，美国五角大楼已经开始例常使用一种机械自动控制的战斗机，并取名为无人驾驶空中飞行机。2001年11月，美国军方使用了遥控空中飞行机&掠夺者号&发射了两枚导弹并成功击中了两位恐怖分子，一位是执行阿凯达军事行动的长官，名叫穆哈曼德·阿特夫；另一位则是奥斯曼·本·拉登的一个最重要同志，当时他正驾车行驶于喀布尔附近的路上。

Microcalorimetric measurements of NH~3 adsorption on catalysts reveal that the remarkable strong acidity and catalytic activity of the Al- promoted catalysts are caused by a change of distribution of acid site strengths and an enhancement in the number of strong and intermediate-strong acid sites effective for the n-butane isomerization and benzoylation of toluene.

NH~3吸附微量热结果表明，Al促进样品的强酸性和催化活性的显著提高是由于样品表面的酸位强度分布发生了变化，有利于正丁烷异构化反应和苯甲酰化反应的中强酸位和强酸位的酸量显著增加。

The statistic analysis of the relationship between the operative amounts and the corrected amount of eye primary position of 177 operations on the horizontal recti showed a positive proportional relation. And the correction effect in degree for each mm of surgery is between 1. 2°～2. 2°, and for different types of strabismus and different surgical treatments, the correction effects for each mm of surgery are different.

对临床177例眼水平直肌手术的手术量与眼位矫正量的关系进行了统计分析，结果表明水平直肌的手术量与眼位矫正量有较好的正相关关系，大约每毫米手术量对应的手术矫正量在〓之间，不同类型的斜视、不同的手术，每毫米手术量对眼位的矫正量不同。

"Victory," President Kennedy told us after the Bay of Pigs disaster,"has a thousand fathers, but defeat is an orphan." At NFM, we knew we had a winner a month after the boffo opening in Kansas City, when our new store attracted an unexpected paternity claim. A speaker there, referring to the Blumkin family, asserted,"They had enough confidence and the policies of the Administration were working such that they were able to provide work for 1,000 of our fellow citizens." The proud papa at the podium? President George W. Bush.

甘乃迪总统在猪猡湾灾难发生后告诉我们，「胜利有成千上万的父亲，但失败却是一个孤儿」，在 NFM 萨斯州分店轰动一时的开幕仪式一个月后，一位胜利者顺利诞生，当时一位声称自己为父亲的人士突然造访，来宾引用 B 太太家族的话表示，他们有信心且行政当局也正努力准备提供 1，000 个就业机会给当地市民，这位在讲台上致词的来宾正是美国现任总统：布什。

"Victory," President Kennedy told us after the Bay of Pigs disaster,"has a thousand fathers, but defeat is an orphan." At NFM, we knew we had a winner a month after the boffo opening in Kansas City, when our new store attracted an unexpected paternity claim. A speaker there, referring to the Blumkin family, asserted,"They had enough confidence and the policies of the Administration were working such that they were able to provide work for 1000 of our fellow citizens." The proud papa at the podium? President George W. Bush.

甘迺迪总统在猪猡湾灾难发生后告诉我们，「胜利有成千上万的父亲，但失败却是一个孤儿」，在NFM萨斯州分店轰动一时的开幕仪式一个月后，一位胜利者顺利诞生，当时一位声称自己为父亲的人士突然造访，来宾引用B太太家族的话表示，他们有信心且行政当局也正努力准备提供1000个就业机会给当地市民，这位在讲台上致词的来宾正是美国现任总统：布希。

A guard was about to signal his train to start when he saw an attractive girl standing on the platform by an open door, talking to another pretty girl inside the carriage.

就在一位列车员即将发出使列车出发的信号时，他注意到了一位迷人的女孩正靠着列车门站在站台上，同车厢里面的另外一位漂亮女孩交谈着。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。