To stabilize its population—discounting immigration—women must have an average of two children.
为了稳定人口——减轻移民的影响——妇女必须平均生育两个孩子。
We can readily calculate that a population with a mean brain size of 1, 750 cc would be expected to have an average IQ of 149.
通过计算我们可以得出，一个脑容积平均为1750cc的种族，其平均智商将为149。
That translates to an annual drop of about 1 percent of the average plankton population between 1899 and 2008.
这意味着自1899年至2008年之间，浮游植物的数量平均每年减少约百分之一。
India, with an average age of 26, is a younger country than China (33), and has started to look on its growing population as a potential asset.
人口平均年龄26岁的印度人比起中国(人口平均年龄33岁)来说是个更加年轻的国家，有鉴于此，印度将其不断增长的人口视为其潜在的财富。
Earth's human population grew 293 percent in the 20th century - compared with an average of 22 percent each of the previous nine centuries - and farmers couldn't keep up.
20世纪地球的人类数量增长了293%，此前的9个世纪平均仅为22%，农民数量显然跟不上总人口的增长。
During that period the world's population was growing by an average of 1.8% a year.
在此期间，世界人口增长了每年1.8%。
They sent New York's prison population soaring, from an average of fewer than 75 inmates per 100, 000 New Yorkers between 1880 and 1970 to five times that rate by the end of the century.
它们使得纽约州的监狱关押人数从1880年至1970年间的平均不到10万纽约人中有75人，在本世纪末时一路飙升了5倍。
The University of Manchester, meanwhile, announced last month that Methodists live seven years longer than the rest of the population, with female Methodists dying at an average age of 91.1.
同时，曼彻斯特大学上个月宣布卫理公会教徒比其他人多活7年，其中女性教徒平均寿命为91.1岁。
The Atlantic population of the giant fish that grows to an average of more than 360 kilograms has fallen by 90 percent.
这种繁衍于大西洋、平均可重达360公斤的鱼的数量缩减了九成。
Africa's rapidly rising population still dampens its growth in real income per head but that, too, has risen by an annual rate of 3% since 2000-almost twice as fast as the global average.
非洲人口的迅速增长更是拖了其人均实际收入增长的后腿，但即使如此，2000年以来非洲的人均年收入增长率还是达到了3%，这几乎是全球平均数的两倍。
The RICS study found the UK now has an average 10% fewer homes than Germany, Italy and France when the size of the population was taken into account.
皇家特许测量员协会的研究显示，当计入人口因素时，英国比德国，意大利，及法国，住房数量少10%。
People age 65 and older spend an average of just over seven hours per day on leisure and sports, compared to just over five hours among the overall population.
同所有居民每天5小时的运动时间相比，65岁以上的老人每天花在休闲运动上的时间至少就有7个小时。
At present, China's elderly population is 130 million, accounting for one fifth of the world's elderly population, and continues to increase at an average annual rate of 3.2%.
目前我国老年人口有1.3亿，占世界老年人口的五分之一，并且继续以年均3.2%的速度递增。
They sent New York's prison population soaring, from an average of fewer than 75 inmates per 100,000 New Yorkers between 1880 and 1970 to five times that rate by the end of the century.
它们使得纽约州的监狱关押人数从1880年至1970年间的平均不到10万纽约人中有75人，在本世纪末时一路飙升了5倍。
Yuanbao at the time had a population of seven hundred households, and 73 landlords and rich farmers were killed, at an average of one death for every ten households. All of the land was redistributed.
在当时，元宝镇共有七百户人家，地主富农被砍杀枪毙了73人，平均每10户就有一人被杀，全部的土地和生产资料被重新平均分配。
Yuanbao at the time had a population of seven hundred households, and 73 landlords and rich farmers were killed, at an average of one death for every ten households. All of the land was redistributed.
在当时，元宝镇共有七百户人家，地主富农被砍杀枪毙了73人，平均每10户就有一人被杀，全部的土地和生产资料被重新平均分配。
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