Age also plays a role in fertility.
年龄也是影响生育能力的因素之一。
Zinc also plays a vital role in fertility.
锌在生育方面也有重要的作用。
There has been tremendous declines in fertility.
生育率在大幅下降。
The target reductions in fertility rates were reached long ago.
降低生育率的目标早已实现。
China is an exception: its fall in fertility has been coerced.
中国例外：其国内生育率的下降是强制性的。
The most important of these is a dramatic plunge in fertility.
最重要的就是生育率的大幅下降。
The world’s decline in fertility has been staggering (see chart 2).
世界范围内的生育率都在急剧降低（见图2）。
The world's decline in fertility has been staggering (see chart 2).
世界范围内的生育率都在急剧降低（见图2）。
However, the fall in fertility is already advanced in most of the world.
然而，世界大部分地区的生育率(繁殖力)已经下降。
There is no guano comparable in fertility with the detritus of a capital.
任何鸟粪都没有首都的垃圾肥效高。
A fall in fertility sends a sort of generational bulge surging through a society.
生育率下降在社会中产生了数量特别多的一代人。
Other countries achieved similar declines in fertility during the same period.
同一时期的其他国家在生育率方面也有着相似的下降现象。
Vital statistics have helped identify major trends in fertility, child survival and child mortality.
关键统计数据可以帮助我们发现生育率、儿童存活率和死亡率方面的主要趋势。
Greater prosperity (and some draconian policies) is already leading to sharp falls in fertility.
更大的繁荣(和一些严厉的政策)已经导致了出生率快速下降。
Despite a tiny uptick in fertility rates in some European countries, the birth dearth continues.
尽管在一些欧洲国家生育率有了微弱的提高，但是低生育率还在持续。
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。
Russia and Eastern Europe have seen little increase in fertility and Mediterranean countries only modest rises.
俄罗斯以及东欧的生育率鲜有增长，地中海国家仅有小幅上涨。
Russia and eastern Europe have seen little increase in fertility and Mediterranean countries only modest rises.
在生育率方面，俄罗斯和东欧地区已经有了小幅度的增长，而地中海沿岸的国家只是略微的上升。
The global economic downturn stopped the first rise in fertility rates in more than 40 years, research reveals.
据英国《每日邮报》29日报道，研究显示，全球经济低迷叫停了四十多年以来的第一次生育增势。
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。
The ageing of the world's populations is the result of the continued decline in fertility rates and increased life expectancy.
世界人口的老龄化是由生育率的不断下降以及期望寿命的增加造成的。
Whether this test will actually encourage a shift in the way men view their role in fertility testing, only time will tell, she says.
她说，这一测试到底会不会改变男性对自身在生育力检查中角色的成见，或许只有时间才会给出最好的回答。
The target reductions in fertility rates were reached long ago. Current rates, he says, are below replacement levels and are unsustainable.
他说，生育率的下降目标早已实现，现在的生育率已经低于人口替换率，这会导致失衡。
The decline was triggered largely by a drop in fertility rates. Between 1952 and 2001 fertility rates fess from 5.1 to 2.7 births per woman.
尽管人们的生育率正在下降，人口增长的速度正所减缓，平均每个妇女所生育的孩子从1952年的5.1个减少到2001年的2.7个。
In addition, the female chimpanzee virus, once after a sharp decline in fertility, birth of the baby they have relatively low survival rate.
此外，雌性黑猩猩一旦携带病毒后生育能力急剧下降，它们产下的幼仔存活率也相对较低。
They attribute to it almost every drop in fertility and every averted birth: some 400m more people, they claim, would have been born without it.
官方将每一次统计的出生率下降都归功于这一政策的实行。他们宣称独生子女政策已经帮助减少了大约4亿多人口。
He also documented a rise in fertility among women, perhaps in part because they were less nomadic and didn't have to carry children from place to place.
他还用大量资料证明妇女生育率的上升，也许在某种程度上是因为她们不再游牧，不必拖儿带女四处奔波。
Minimizing the genetic drift in fertility was key to the purification and reproduction of thermo photo sensitive genic male sterile (TPSGMS) lines of wheat.
最大限度控制育性的遗传漂移，是小麦温光敏核不育系提纯中要解决的主要问题。
There was no significant difference in fertility rate, cleavage rate, high-quality embryonic rate and graftage embryonic number between these groups(P>0.05).
各组间受精率、卵裂率、优质胚胎率、移植胚胎数比较差异均无显著性（P>0.05）。
Academics found that the recession of 2008-09 led to a decline in fertility rates as young, professional women feared for their financial future if they became pregnant.
学者认为2008- 2009年的经济衰退导致生育率下降是因为年轻的职业女性担心怀孕会影响到她们未来的收入状况。
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