The results showed the surface contamination produced in sample preparation and treatment can be eliminated if the sample was sputtered for enough time.

实验表明：样品经足够长时间的溅射，可以消除样品制备和处理过程中的表面污染，可以为其它高纯材料的检测提供可靠的科学依据。

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Adopting optimized machining parameters of Laser-Microjet, higher cutting speed, higher surface quality, no surface contamination, and no oxidation is visible.

采用优化的水导引激光加工参数，对材料去除效率高，加工质量好，不产生污染空气的加工产物。

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A three layer of aluminum exposed to atmosphere is identified: the aluminum and its native oxide, the corrosion layer atop oxide aluminum, and a surface contamination layer.

暴露于大气中的铝表面呈现三层结构，即氧化铝和氢氧化铝层、其上的腐蚀产物层和最上层的污染物沉积形成的污染物层。

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And what prevents soil and surface water contamination from countless units that ultimately wind up in landfills?

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In Washtenaw County and Ann Arbor, Michigan a 1, 4-Dioxane, in groundwater and surface soil contamination from Gelman Science, persists after nearly 20 years of cleanup activities and has now spread in groundwater to an area over three miles long and a mile wide.

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The remaining soil contamination is located several feet below uncontaminated surface soil.

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