Fertility decline begins at age 28.
生育能力从28岁就开始下降。
THE FERTILITY DECLINE that is now sweeping the planetstarted at different times in different countries.
如今已经席卷全球的生育率下降，在不同国家开始的时间也不同。
This fertility decline has meant dramatic reductions in the risks of childbirth while freeing up women to enter the labor force.
生育率下降意味着生育风险大幅减少，同时使妇女解放出来加入劳动队伍。
Recently, aiming at the reasons causing water and soil losses and fertility decline on the red soil drought farmland in Yunnan Province, the research and analysis have been carried out.
针对云南省红壤旱耕地近年来出现的水土流失、肥力下降的问题，研究分析问题产生的原因；
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）。
In almost every Arab country, fertility is in decline, more people, especially women, are becoming educated, and businessmen want a bigger say in economies dominated by the state.
几乎所有阿拉伯国家的生育率都在不断地下降。
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。
One is the familiar place of low fertility and population decline.
其一是大家熟知的低出生率和人口减少的地区。
Across the region, fertility rates are starting to decline.
在整个非洲地区，生育率开始下降。
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。
Tracking the changing "price" of women, Mr. Porter turns his eye to America's fertility rate, which went into steep decline around 1970.
追溯女人“价格”的变化，波特先生把他的目光投向美国妇女生育率。 美国的妇女生育率在1970年左右就已经进入到下降趋势。
In some countries the speed of decline in the fertility rate has been astonishing.
有些国家生育率的下降更是惊人地快。
At a time when Malthusian worries are resurgent and people fear the consequences for an overcrowded planet, the decline in fertility is surprising and somewhat reassuring.
当下，正值马尔萨斯主义的忧虑卷土重来、人们为地球人口过盛将导致的后果忧心忡忡之时，生育率的下降实在令人瞠目，也多少令人感到些许欣慰。
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）。
In some countries the speed of decline in the fertility rate has been astonishing.
不见如此，在有些国家，儿童出生率下降速度之快令人瞠目结舌。
Combining cell morphology, the growth and decline state of tapetum in anther wall tissue are closely related with pollen fertility and amino acid metabolism.
结合细胞形态学观察，药壁组织的绒毡层的发育与解体状况和花粉育性、氨基酸代谢有着密切关系。
After a steady decline for almost a whole decade, the country's fertility rate shows signs of leveling off.
全国的生育率在连续下降了近10年后，现在出现了稳定的趋势。
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。
The American fertility rate is around the replacement rate of 2.1, compared with 1.4 for Germany and Italy, where populations are in decline.
美国的出生率为 2.1 ，很接近人口更替率，但是德国和意大利的出生率只有 1.4 ，也就说人口数量在下降。
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。
Women are most fertile between the ages of 17 and 25. After this, fertility gradually decreases with age, with a gradual decline into the 30s and a sharp decrease after the age of 35.
女性17岁到25岁是最多产的年龄，然后随着年龄增长步入30逐渐降低，35岁以后，下降程度更加地大。
People are interested in improving production of dairy cattle over the last decade, meanwhile the trend to poorer fertility and longevity is obvious, and a decline in economic has been observed.
近几十年以来，人们对奶牛的选育一直偏重于提高奶牛的产奶量，伴随而来的是奶牛的繁殖能力、使用寿命等性能的恶化，从而导致一定程度上奶牛业经济效益的下降。
People are interested in improving production of dairy cattle over the last decade, meanwhile the trend to poorer fertility and longevity is obvious, and a decline in economic has been observed.
近几十年以来，人们对奶牛的选育一直偏重于提高奶牛的产奶量，伴随而来的是奶牛的繁殖能力、使用寿命等性能的恶化，从而导致一定程度上奶牛业经济效益的下降。
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