农民们和兴趣爱好者们选那些幸存下来的继续繁殖，不断创造出植物新品种和动物新品种，这些给了查尔斯·达尔文一个启示。
Farmers and fanciers continually created new plant and animal varieties by selecting who survived to breed, thus handing Charles Darwin an idea.
那些存活下来的病原体能继续繁殖，通常这些病原体种群会产生抗药性。
The rare ones that survive reproduce, often creating a population that's antibiotic resistant.
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