An American mother has given birth to twins, who have different fathers.

美国妇女生下一对双胞胎，但两个孩子的父亲却并非一人。

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New fathers did not do more work because they did not realize the mother was doing so much more.

新爸爸们没有做更多的事情，因为他们没有意识到妈妈做的事情太多了。

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Fathers at home "are still often second-class parents," since the mother usually stays home first and establishes routine, Mr. Rojas said.

呆在家里的父亲“依然是二等家长”，因为是常常是母亲先呆在家里，规划好各项家务的安排，罗哈斯先生说。

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By comparing the progress of tadpoles with different fathers but the same mother, the paternal genetic influence was easy to see.

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