Demographors are perhaps best known for making population projections.
人口学家或许在人口预测上最为知名。
Last July the French statistical office announced new population projections.
去年七月，法国统计部门公布新的人口计划。
The population projections they derive make the “high-count” hypothesis “highly implausible,” they argue.
这个预测使他们能够争论“高支”假设是“难以置信”的。
Another speculation is that the human lifespan could be greatly extended, something that would wreak havoc on all population projections.
还有一种推测是，人类的寿命将大大延长，这将极大地扰乱对未来人口的各种预测。
Using research methods on the domestic and foreign literatures, it summarizes the situation of aging. This paper draws on existing research results, especially in population projections.
运用文献研究方法对国内外老龄化研究现状进行综述，本文借鉴了已有的研究成果，尤其在人口预测方面。
By combining these projections with the Census Bureau's estimates for the growth in the working-age population, they calculate likely changes in the overall supply of workers.
将这些项目和人口调查局对工作年龄段人口增长的预测进行综合考虑，他们计算出工人总供给的可能变化。
According to Census Bureau projections, by 2050 Hispanic Americans' share of the population will double to 30 percent.
根据美国人口普查局预测，到2050年西班牙语系的美国人占总人口的比例将翻番至30%。
A third of the world's population could be infected with swine flu, expert projections suggest.
三分之一的世界人口可能感染猪流感，专家称。
Only 17% of the U.S. population will be 65 or older by 2022, according to projections.
2022年65岁或以上的人群将达到人口的17%。
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。
Projections of population distribution could be of useful reference in urban planning, which would support effective resource allocation at local levels in future.
人口推算分布具参考价值，有助地区层面的城市规划及未来资源分配。
By 2050, some projections suggest Nigeria will have the third largest population in the world.
一些预测认为，到2050年，尼日利亚的人口将达到世界第三。
By 2050, some projections suggest Nigeria will have the third largest population in the world.
一些预测认为，到2050年，尼日利亚的人口将达到世界第三。
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