Advantages sof direct sampling are that areas hardest to clean and which are reasonably accessible can be evaluated, leading to establishing a level of contamination or residue per given surface area.
直接取样的好处是可以评估难以清洗和相当容易接近的区域，使得可确定每个给出的表面区域的污染物或残留物的级别。
The growth dilution of the tomato decreased the level of pesticide residue in the tomato.
番茄的生长稀释，降低了番茄中的农药残留水平。
Furthermore, residue of pesticides in agricultural products has been increasing in both kind and level, especially the organophosphates.
此外，残留农药的种类和数量逐年增加，其中有机磷农药问题尤为突出。
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