A woman's body may be unconsciously selective about sperm, allowing some men's to progress to pregnancy but killing off the chances of less suitable matches, an Australian researcher said Wednesday.

　　澳大利亚一位研究人员今天说，女性身体可能无意识地对精子加以选择，让部分男性的精子成功致孕，扼杀不匹配男性精子致孕的机会。

　　University of Adelaide professor Sarah Robertson said her research suggested that sperm contains "signaling molecules" that activate immunity changes in a woman so her body accepts it. But some apparently healthy sperms failed to activate these changes, leading to the suggestion that the female system can be "choosy" about its biological mate, she said.

　　阿德莱德大学教授莎拉-罗伯逊说，研究表明精子含有“信号分子”，可以激活女性免疫系统的变化，让她的身体接受自己。她说，但有些显然健康的精子不能激活这些变化，这让人联想到女性身体系统对配偶可能是“挑剔的”。