Samples recovered from the expedition revealed important differences in chemical composition and fossil distribution among the sediment layers.

探险队采集的样品揭示了沉积物层之间化学成分及化石分布上的重大差异。

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Air diffusion can impact the pollutant distribution in atmosphere, and so do some non-diffusion aspects such as dry sediment, wet sediment and chemical translation.

污染物在大气中被稀释扩散时，还会发生干沉积、湿沉积和化学转化过程，所有这些都会影响污染物在大气中的分布。

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The distribution characteristics of HCB discharged from a chemical plant in water, sediment, soil and plant sample was studied.

研究了某化工厂排放的六氯苯在水体、沉积物、土壤和植物中的分布情况。

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In any case, the world-class agriculture in the delta employs advanced seed technology and chemical fertilisers, and does not depend on river-borne sediment of negligible nutrient value.

ECONOMIST: Letters