Sanitary conditions are controllable within a dehydration pant, whereas in open fields contaminationfrom 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。
2
Sources of this include the medical use of radioactive materials, fallout and contaminationfrom nuclear industry, and the storage and dumping of radioactive waste.
辐射源包括医用放射性材料、核工业的放射性沉降物和污染物，以及辐射废弃物的积存和倾倒。
3
Like NOP, JAS explicitly requests that organic fields must be separated from conventional fields, to prevent cross contaminationfrom fertilizers and pesticides (buffer zones).