婚外孕

lì yòng dà guī mó nián dù diào chá shù jù tā yán jiū le suǒ yǒu hūn wài yùn de fù nǚ

利用大规模年度调查数据，他研究了所有婚外孕的妇女。

Using data from a big annual survey, he looked at all the women who had become pregnant outside marriage.