过去曾对双酚a对雄性动物的生殖系统影响进行过研究，而对人的生殖能力影响的研究，现在还是第一次。
Both studies are the first to look at BPA's reproductive effect in humans. The adverse effect of BPA on the male reproductive system previously had been examined in animal studies only.
小鼠可作为雄性生殖衰老研究的动物模型。
Mouse would be served as a good model for male reproductive aging research.
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