International clinical geneticist Dr Stephen Withers said that the 'black and white' twins happened with a probability of 'two-in-a-million'.

遗传学家斯蒂芬·维特博士表示，这种黑白双胞胎发生的几率只有仅为五十万分之一。

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The writer, a medical geneticist, is director of clinical services and community outreach, Program for Jewish genetic Health at the Albert Einstein College of Medicine.

留言者是位医学遗传学家，在爱因斯坦医学院犹太基因健康项目组中担任临床与社区拓展服务方向的主管。

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