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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It turns out that there was a leak in the storage bin containing the rocks , so NASA's scientists assumed that the slight amount of water in the rocks was due to contamination from earth's atmosphere.

因为美国宇航局的科学家们认为岩石中这些少数的水是由于地球大气污染的结果。

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The soil and vegetable Hg had close relations with atmosphere Hg, and the automobile exhaust Hg contamination degree of the highway profiles increased with increasing road age and vehicle flow.

大气汞含量与蔬菜和土壤的汞污染具有明显的相关性。公路系统汽车尾气汞污染强度随公路路龄、车流量增大而增强。

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