镉难于被生物分解，在土壤中积聚数个世纪后才被植物吸收，最终被人类经过食物链摄取。

Cadmium is difficult to be biodegradable, accumulate in the soil for many centuries before being absorbed by plants, eventually the human food chain through ingestion.

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但由于受流型、油泡直径及吸收系数等因素的非线性影响，使得测量模型难于建立。

Because of the nonlinear effect caused by flow pattern, oil diameter and absorption coefficient etc, it is difficult to establish the measurement model.

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