交换

Exchange aircrew offer the hosting unita different perspective than what they are used too, said SQNLDRHarper.

被交换的空勤人员也同时为接收单位带来新的知识。

Hu said he will meet with Japan's Emperor Akihito, have an in-depth exchange of views with Japanese Prime Minister Yasuo Fukuda on bilateral relations and other issues of common concern, and have extensive contact with Japanese people from different walks of life.

胡锦涛表示，他将会见明仁天皇陛下，同福田康夫首相就中日关系和共同关心的问题深入交换意见，广泛接触日本各界人士。

So this dissertation will pay attention to the process of separating ALA from fermentation broth.

因此本文主要探讨了用离子交换法分离ALA的工艺。

This is the princlpte of equivalent trade in alchemy.

这是平等交换的原则。

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。

Alcoholysis of urea is considered to be a novel and promising process in synthesis propylene carbonate, and the transesterification process to synthesize diphenyl carbonate is also payed much attention.

尿素醇解法合成碳酸丙烯酯是目前较为新颖和有前途的合成方法，而酯交换法合成碳酸二苯酯一值受到人们的关注。

Alexandra: No, I'm from Greece.I'm an exchange student.

不是， 我是从希腊来的，我是一名交换学生。

Alexandra :I'm an exchange student.

我是一名交换学生。

Computing integral closure of a finite extension is not only an important problem in commutative algebra, but also in algebraic geometry and algebraic number theory.

计算有限扩张的整闭包不但是交换代数中的一个核心问题，也很受代数几何以及代数数论发展的推动。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。