水体中泥沙的含量和石油类污染物的初始浓度均显著影响石油类污染物的生物降解速率，且在不同时段的影响不一；
The biodegradation rate was greatly influenced by the sediment content and the initial concentration of petroleum contaminants, and such effect was different from one degradation stage to another.
污染物生物降解的速率和程度与微生物的数量和活性关系密切。
The rate and degree of biodegradation were highly related to the number and activity of bacteria.
可生物降解聚合物中的层状硅酸盐纳米复合材料，可极大提高其力学性能，但同时会影响到材料的降解速率。
Layered silicate nanocomposites of biodegradable polymers can greatly increase mechanical properties of the polymers, which have influence on the degradable rates of the polymers.
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