科学家认为，这是植物防止树木疾病传播的方法，并给像毛毛虫之类的食叶昆虫制造些生存上的困难。

Scientists think this is the plants' way to prevent the spread of any tree diseases and make life more difficult for leaf-eating insects like caterpillars.

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此外，有一个已经被充分证明的使用药物阻止病毒传播的方法。

Moreover, there is already one well-proven way of stopping the virus's transmission using drugs.

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在科学研究的传统发布途径外，还存在一些未发表或传播的方法学研究。

There are also technical studies that are not published or distributed by the habitual channels of scientific transmission.

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Separating our water supply from sewage and learning how to do wastewater treatment was a really important part of reducing infectious diseases.

把净水和污水分开,以及学会污水处理的方法,是减少感染性疾病传播方法中的重要部分

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But ultimately, the best way, the optimal way spreading happiness is to work on your own happiness, because then you are leading by example.

但最好的方法，传播快乐的最佳方法是努力争取自己的快乐，因为那时你就成为榜样。

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So, this is the stage at which you prevent disease in the Salk vaccine.

那么,这就是索尔克氏疫苗,防止疾病传播的方法

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