This paper prepared sodium lauryl sulfate with two different methods, and compared the prepared sodium lauryl sulfate's property with standard analytical pure sample.

介绍了用两种不同的方法制备十二烷基硫酸钠，并对制备出的产物的性能与分析纯的标样进行了比较。

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A training sample needs to be pure text, extracted from a sample document of the category in question.

训练样本应该是纯文本，是从涉及的目录的样本文档中提取出来的。

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Note that this figure may not exactly be pure UML, as UML is usually used to model a single system, whereas the sample application is really composed of three systems.

请注意，准确地说，这个图不是纯粹的UML，因为UML常常被用来模拟一个系统，而样本应用程序实际上由三个系统组成。

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By contrast, if the sample comes back pure, researchers can then focus on identifying clues as to where the organics came from.

MSN: New Mars rover hunts for life by 'cooking' rocks

Meanwhile, Hong Kong's Center for Food Safety announced Sunday that a sample of Nestle Dairy Farm Pure Milk, sold in one-liter packs for catering use only, had tested positive for melamine.

CNN: Almost 13,000 Chinese children sickened by tainted milk