Most women's fertility declines dramatically as they reach the age of 40.
多数女性的生育能力在她们40岁的时候会显著下降。
Populations can rise while fertility declines because of inertia, which matters a lot in demography.
根据人口统计学，生育率降低时人口因为惯性仍然会增长。
The college fears too many women still do not understand that their fertility declines after 35.
该学院担心的是许多妇女仍然不知道35岁后生育能力会降低。
The hard truth is that decades of research have proved that a woman's fertility declines over time.
冷酷的事实就是这样，过去几十年的研究证明女性的生育能力随着时间流逝逐渐下降。
Don't wait too long: Male fertility declines with age, researchers have warned (picture posed by model).
不要长久等待：研究人员警告，男性生育能力随年龄增长而下降(图片来自model)。
Unfortunately a woman's biological clock is no joke. Most women's fertility declines dramatically as they reach the age of 40.
多数女性的生育能力在她们40岁的时候会显著下降。
Many women are choosing to have children later in life. And because fertility declines with age, delaying pregnancy also means that many couples will experience infertility.
目前越来越多的女性选择晚育，而生育能力随着年龄增长而下降，因此推迟怀孕也就意味着许多夫妇将会面临不育。
But he said that fertility declines in the years leading up to menopause, so more research is needed to work out if AMH levels can determine the point at which fertility actually drops.
但是他同时也表示，这些年来，女人的生育能力已日渐下降，并很早就进入更年期，所以有关抗苗勒氏管激素是否能确定女人的生育能力在什么时候开始下降的研究还有很多呢。
There has been tremendous declines in fertility. The key has been the prevention of unwanted births, really around the globe.
生育率在大幅下降。关键是真正做到在全球各地预防计划外生育。
Dramatic declines in fertility rates in some countries and high rates in others pose a critical challenge.
有的国家生育率骤降，而有的国家生育率却居高不下，两种局面并存，人类面临着严峻的考验。
Dramatic declines in fertility rates in some countries and high rates in others pose a critical challenge.
有的国家生育率骤降，而有的国家生育率却居高不下，两种局面并存，人类面临着严峻的考验。
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