The advice comes from information written by Jenny Dean of the Intermediate Technology Development Group in Britain.

VOA: special.2010.08.02

And what it's used is to convert one type of group, what's called a carboxylic acid into another type of very reactive intermediate, which is called an acid chloride.

它被用来将一类被称作羧酸的化合物，转化成另外一类活性很高的反应中间体,也就是酰氯。

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Practical Action (formerly the Intermediate Technology Development Group) is dedicated to just that.

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One further worry is the possibility that the selling in Priceline could be hinting at the potential for further, intermediate-term weakness in the group, with stocks like Expedia (NASDAQ: EXPE) and Orbitz Worldwide (NYSE: OWW) appearing increasingly vulnerable.

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"Many are stuck at an intermediate level of development, " said Shelly Spiegel-Coleman, the group's executive director.

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