The fashion for having children later in life could lead to women becoming more fertile in their 40s and beyond, scientists have suggested.

　　科学家指出，现在的晚育趋势将让未来女性40岁以后的生育能力增强。

　　As many women wait until they are older to give birth, only those with longer lasting fertility genes will be successful.

　　许多女性会等到年龄很大时才生育，而只有那些带有更持久的繁殖基因的女性才会成功晚育。

　　That means the average length of fertility will grow as their genes will be passed on to their children.

　　这意味着生育能力持续的平均时间会随着她们的基因遗传给下一代而变长。