美国阿肯色州一名孕妇出现罕见的异期复孕（Superfetation）：她怀有女儿后两周半左右，再度怀下一名儿子。产科医生在六月替该名妇人照超声波时，发现这个百万分之一机会出现的情况。
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"superfetation is normal in some animal species"
以上来源于: WordNet
N the presence in the uterus of two fetuses developing from ova fertilized at different times 异期复孕 [physiol]
Mrs Grovenburg's pregnancy was eventually identified as "superfetation".
格鲁温伯格女士最终被确定为是“重孕”。
Mrs Grovenburg's pregnancy was eventually identified as "superfetation", meaning two babies are conceived at different times, born on the same day yet - medically speaking - are not considered twins.
格鲁温伯格女士最终被确定为是“重孕”，就是说她在不同的时间段怀上了两个孩子，但是孩子在同一天出生了，从医学上说，他们并不是双胞胎。
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