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Sanitary conditions are controllable within a dehydration pant, whereas in open fields contamination from dust, insects. birds and rodents are major problems.

脱水工厂内部的卫生条件是可以控制的，而在旷野上，受灰尘、昆虫、鸟类和齿动物污染是主要问题。

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Like NOP, JAS explicitly requests that organic fields must be separated from conventional fields, to prevent cross contamination from fertilizers and pesticides (buffer zones).

与NOP相似，JAS要求有机地块与常规地块之间必须建立隔离带，以防止交叉污染。

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To date,there has been no evidence of contamination in the river from the oil spill.

VOA: standard.2010.05.08

Cesium remains the most widely dispersed isotope while concerns remain over long-term contamination from strontium and plutonium.

CNN: Chernobyl: Environmental dead zone or eco-haven?

And what prevents soil and surface water contamination from countless units that ultimately wind up in landfills?

FORBES: How Many Politicians Are Needed To Screw Up A Light Bulb?

Woodland burials are currently not allowed in Jersey, due to fears of contamination from metal contained in people's bodies.

BBC: Jersey minister proposes freeze drying dead bodies