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。

youdao

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