来自《耶鲁大学开放课程：1600年后西方社会的流行病 第14集 第14集》
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Its Nature, Mode of Spreading and Prevention, in 1873.即《伤寒的本质 传播途径及预防》 -
and he referred to the unchanging他提到疾病的 -
specific nature of the disease.特殊本质是不变的 -
Let's listen to what he said.He said this:我引用他书中的原话 -
"To propagate itself and no other,为了在一系列不确定的进化过程中 -
and that on a series of indefinite progressions,确保自身的正确繁衍 -
constitutes the very essence of the relation形成了物种的观点 -
on which the idea of species is founded.及它们之间本质的亲缘关系 -
How much this applies in the animal and plant world这一点在动植物界中 -
we all know.我们都了解 -
It is strange that what it implies,但是在疾病的成因上 -
in the case of diseases,它却显得很奇怪