The world's population more than doubled from 3 billion between 1961 and 2007.
1961年世界人口为30亿，到2007年翻了一番多。
For example, it makes aging population more serious.
例如，人口老年化越来越严重。
World population more than doubled from 1950 to the end of the 20th century.
从1950年到20世纪结束，世界人口增长了超过一倍。
This allows Costa Rica to use its female population more productively than is true in most of the region.
这使得哥斯达黎比其他地区更有成效地利用其女性人口。
Its population more than tripled between 1900 and 1960; its relative weight within North America also increased.
从1900年到1960年，该省人口翻了三番多，在北美的分量也有所上升。
With expansion of urban population more and more families crowd themselves into apartments in high buildings.
随着城市人口的增加，越来越多的家庭都挤进高楼里的公寓。
The attacks have taken place in seven different rural central Texas towns, none of which with a population more than 6, 000.
袭击已在德州中部七个不同的乡镇发生，其中每个乡镇的人口都不超过6000人。
Between 1000 and 1300 Europe's urban population more than doubled, to about 70m (thanks partly to a new system of crop rotation, made possible by better tools).
公元1000年和1300年间，欧洲城市人口翻了一倍多，达到7千万人(与改良工具后人们运行了新式的轮作系统有关)。
Discrimination - "age apartheid" might be a better term - is one way to describe what's going on here: no country sorts its population more ruthlessly by age.
歧视-“年龄歧视”可能是一个更好的词-是一种可以描述发生在这里的事情的方法：没有国家比按年龄排序更残酷。
The world's population more than doubled from 3 billion between 1961 and 2007, yet agricultural output kept pace - and current projections (see page 546) suggest it will continue to do so.
世界人口从1961年的30亿到2007年的翻了一倍多。当前农业产量(见546页)紧跟其上——并估算显示此情况将持续下去。
Today, as urban population explodes globally, cities become more crowded.
今天，随着全球城市人口激增，城市变得更加拥挤。
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
为了做出更准确的人口预测，人口统计学家必须比现在更多地了解生育率的社会和经济决定因素。
Providing more food for the rapidly increasing population is yet another role for the mechanical engineer.
为快速增长的人口提供更多的食物是机械工程师的另一个角色。
They think its population grew rapidly and then remained more or less stable until the arrival of the Europeans, who introduced deadly diseases to which islanders had no immunity.
他们认为岛上的人口增长迅速，然后保持或多或少的稳定速度来增长，直到欧洲人的到来引进了岛上居民对其没有免疫力的致命疾病。
More irrigation works would have to be built to feed the growing population, and this resulted in more power and wealth for the elite.
国家必须修建更多的灌溉工程来养活不断增长的人口，这为精英阶层带来了更多的权力和财富。
I mean, as the population grows and there are more vehicles on the roads and there's more machinery, surely they can't depend so much on sugar cane?
我是说，随着人口增长，路上车辆更多了，机械也更多了，他们肯定不能只依赖于甘蔗（作为生物燃料）吧？
Competition is usually the more severe the denser the population.
通常是人口越密集，竞争越激烈
The world's population has more than tripled during this century, and world output has risen hugely, so you would expect the earth itself to have been affected.
本世纪世界人口增长了两倍多，世界产出也大幅增长，所以你会认为地球本身也受到了影响。
As the average age of the population increases, there are more and more old people to care for.
随着人口平均年龄的增长，有越来越多的老年人需要照顾。
Compared with the rest of the population, older people are also more likely to own their own homes and be less mobile than renters, who can move to new job markets.
与其他人口相比，老年人更有可能拥有自己的房子，他们的流动性也比租房的人小，因为后者可能转移到新的就业市场。
Rice is the staple food of more than half the world's population.
大米是世界上半数以上人口的主食。
The population would be fitter, healthier and produce more winners.
国民将更加健壮、更健康，并产生更多的冠军。
In California, where population growth has averaged more than 600,000 a year for at least a decade, more residential housing is being built.
在其至少十年来平均每年的人口增长超60万的加州，人们正在建设更多的住宅。
As world's population continues to grow, the supply of food becomes more and more of a concern.
随着世界人口的持续增长，粮食的供应问题越来越令人担忧。
Emerging from the 1980 census is the picture of a nation developing more and more regional competition, as population growth in the Northeast and Midwest reaches a near standstill.
从1980年的人口普查中可以看出，随着美国东北部和中西部的人口增长接近停滞，地区间的竞争越来越激烈。
It was once assumed that improvements in telecommunications would lead to more dispersal in the population as people were no longer forced into cities.
人们曾经认为，随着人们不再被迫进入城市，电信的发展将导致人口的进一步分散。
Over the past century, human use of fresh water has increased at more than double the rate of population growth.
在过去的一个世纪里，人类对淡水的使用以超过人口增长率两倍的速度增长。
Their allele frequencies at numerous genetic loci gradually become more and more different as new alleles independently arise by mutation in each population.
随着新等位基因在每个群体中独立突变产生，它们在许多遗传位点上的等位基因频率逐渐变得越来越不同。
The grizzly population in the Yellowstone region has climbed to an estimated 600, 100 more than the recovery goal.
黄石地区的灰熊数量已经上升到约600头，比恢复计划的目标多出100头。
The grizzly population in the Yellowstone region has climbed to an estimated 600, 100 more than the recovery goal.
黄石地区的灰熊数量已经上升到约600头，比恢复计划的目标多出100头。
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