研究成果表明，河漫滩表层沉积物是森林超低密度地球化学调查的最佳采样介质。

Studies show that surface sediments of the flood land seem to be the best sampling media in ultra-low density geochemical investigation in forest-swamp areas.

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土壤是承载有机污染物的重要介质，而光降解是降解土壤表层有机污染物的一种非常重要的非生物转化途径。

Soil is an important medium in which various organic pollutants can exist, while photodegradation is an effective abiotic transformation means for organic pollutants in surface soil.

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表层过滤，过滤介质使用寿命长，化学再生的使用频率少。

For the surface layer filtration, the filter medium will have long service life, and chemical regeneration will not be frequently used.

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