美国心脏协会科学年会上发布的一项新的研究中阐明了原因。

And new research, presented this week at the American Heart Association's Scientific Sessions, offers clues for why.

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今年的澳大利亚生育协会科学年会已经被告知六对夫妇便有一对有严重的生育问题，而其中一半是由男性的生殖问题引起。

The annual scientific meeting of the Fertility Society of Australia has already been told that one in six couples have serious fertility problems, with half caused by male reproductive issues.

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