Although the research station is far from major sources of human pollution, atmospheric circulation brings air from Europe and North America into the Arctic region.
虽然这个研究站远离人类主要的污染源，但是大气环流会把欧洲和北美的空气带到北极地区。
According to the heavy metal contents in the fruits, soil absorption and atmospheric dust become the main sources of heavy metal pollution in crops.
通过对不同处理方式处理后的水果中重金属的分析表明，土壤吸收和大气尘降是农作物中重金属的主要来源。
The mineral composition and morphology of atmospheric dust fall serve as important criteria in identifying pollution sources.
大气降尘矿物成分和形貌特征是判别污染物来源的重要标志。
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