如西非人以及他们的后代易患一种叫做镰状细胞性贫血的疾病，这种病在西非之外几乎都没人听说过。
West Africans, and people of West African descent, are susceptible to a disease called sickle-cell anaemia that is virtually unknown elsewhere.
英国生化学家Anthony Allison在20世纪50年代观察到非洲人携带单拷贝的基因突变引起的镰状细胞性贫血保护了他们受到疟疾的侵扰。
In the 1950s Anthony Allison, a British biochemist, observed that Africans who carry a single copy of the genetic mutation that causes sickle-cell anaemia are protected against malaria.
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