医疗固体废物对环境造成的污染危害具有传染性，研究其处理状况具有现实意义。
It is infective that the medical solid waste endangers the pollution that the environment causes, studying it and dealing with the state has realistic meaning.
家畜疾病，尤其是一些传染性疚病是畜牧业生产的大敌，过度使用药物又会造成食品污染。
The domestic animal disease, particularly the contagion diseases is big enemies to livestock husbandry and prodution, which restrict the developments of the livestock husbandry.
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