Rural counties gained population in the 1990s , a development that surprised demographers who dubbed it the " rural rebound . " this movement continued in 2001 and after 1990年代乡村人口锐增，人口统计学家对此大为惊讶，称之为“乡村反弹” 。这一增长持续至2001年之后。
Its population exceeds already 1 300 000 000 on the year 2001 . according to the estimation of the occidental independent demographers , the number reaches already 1 500 000 000 on 2001 总人口已一超出十三亿1 300 000 000 ,但西方独立的人口专家估计目前此数已经达到十五亿1 500 000 000 。
Demographers have noticed an unusual upsurge in marriages between pensioners and much younger partners in the countryside , probably provoked by this benefit 人口统计学家已经注意到养老金受益者和边远地区的年龄小他们很多的人结婚越来越普遍，这种不正常的现象也许就和这种福利制度有关。
Population index ? covers all fields of interest to demographers , including fertility , mortality , population size and growth , migration , muptiality and the family , and research methodology 人口索引向人口学家，包含死亡人数，人口数量和成长，迁移，结婚率和家庭的研究方法覆盖所有的使人感兴趣的领域。
Sociologists and demographers have discovered that couples who have at least one son face significantly less risk of divorce than couples who have only daughters . why is this 社会学家和人口统计学家已经发现那些有至少一个儿子的夫妇们面临的离婚风险要比那些光有女儿的夫妇离婚风险更低。这是什么原因呢？
William frey , a demographer with the university of michigan population studies center believes that the 300 millionth american will be conceived this month somewhere in the suburban south or west 密歇根大学人口研究中心的人口统计学家威廉?弗雷认为第3亿个美国人将出生在南部或西部的城郊,这一新生命将在本月孕育出来
Demographers and geographers attribute the slowing largely to the recession , which has hit california particularly hard , leaving its once - robust economy to bring up the rear of the national recovery 人口学家和地理学家把缓慢的情形都归咎于不景气，加州情形尤为严重，以致加州一度蓬勃的经济竟然在全国复苏中落在各州之后。
Demographers and geographers attribute the slowing largely to the recession , which has hit california particularly hard , leaving its once - robust economy to bring up the rear of the national recovery 人口学家和地理学家把缓慢的情形都归咎于不景气，加州情形尤为严重，以致加州一度蓬勃的经济竟然在全国复苏中落在各州之后。
The abortion rate among women between the ages of 20 and 29 - who were presumably aware of contraception - had also doubled , said margarita delgado , a demographer with the science research council in madrid . many were married or had stable partners 西班牙科学研究委员会人口统计学家玛格丽塔德尔加多表示，在20岁到29岁年龄段的女性中，堕胎率同样翻了一番，其中很多人已经结婚或是拥有固定的性伴侣。
In the absence of such a direct method , a few years ago veteran demographer barry edmonston used sophisticated mathematical modeling techniques to calculate how intermarriage is changing the face of the united states as part of an immigration study he directed for the national research council of the american academy of sciences 几年前，由于这种直接统计方法还没有实施，资深人口统计学家巴里.埃德蒙斯顿在指导美国科学院全国研究会所做移民研究时，便利用复杂的数学模型来计算异族婚姻是如何改变美国面貌的。
