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A pair of Vietnamese fraternal twins have been confirmed to have different fathers, a local genetic association has told the BBC. The twins had their DNA tested after their family noticed they looked different, said local reports. 当地一家遗传机构接受BBC采访时透露，一对越南的异卵双胞胎已被证实来自不同的父亲。据当地媒体报道，该双胞胎在其家属觉察长相不同后，接受了DNA测试。 The occurrence, known as heteropaternal superfecundation, is rare with few publicly known about. It happens when a woman's eggs are fertilised by two men within a short period of time. 发生的这一案例被称为异父超级受精，这是一种鲜为公众所知的罕见案例。这只会发生在女性的一个卵子在短时间内被两名男性的精子受精的情况下。 Professor Le Dinh Luong, president of the Hanoi-based Vietnam Genetic Association which did the DNA testing, said the results were "100% correct" in what he called "an extremely rare case". 总部位于河内的越南遗传学会负责了本次DNA测试，其董事长Le Dinh Luong教授表示，这个“极为罕见的案例”的测试结果“百分百正确”。 | 
