as something unprecedented, unnatural, that never happened before.

一种全新的非自然的疾病
But the reality is that Charles Darwin was correct.

但事实上查尔斯达尔文是正确的
We live in the midst of a constantly evolving microbial world

我们正生活在一个微生物不断进化的世界
in which the microbes have an inherent advantage

微生物因其频繁的变异
because of the frequency of their mutations,

而占有遗传优势
and the extremely brief length of a microbial generation,

同时与人类相比
compared with a human one.

微生物拥有较短的生命周期
So, new diseases have always been emerging and appearing.

因此新疾病不断涌现
And Asiatic cholera is a good example of what we might--

亚细亚霍乱就是一个很好的例子
though let's be mindful, it would be historically anachronistic--

我们研究它很有意义
we might call it a great emerging disease of the nineteenth century.

如果把它称作十九世纪的病毒是不正确的
There is a scholarly debate on whether cholera had long existed

这里有一个学术争端