由于人口的猛增或大量人口流动（现代交通工具使这种流动相对容易）造成的种种问题也会对社会造成新的压力。
Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements—themselves made relatively easy nowadays by modern means of transport.
美国一直是一个流动性很强的国家，但美国人口普查局的最新数据显示，美国的人口流动率已降至有记录以来的最低水平。
The US has always been a remarkably mobile country, but new data from the Census Bureau indicate that mobility has reached its lowest level in recorded history.
可能在人口流动性方面最具说服力的标志是，公元前3000年，在这片广袤的土地上大部分牧民讲的相关语言，现代印欧语系就从中发展而来。
Perhaps the most striking sign of mobility is the fact that by the third millennium B.C., most pastoralists in this huge region spoke related languages ancestral to the modern Indo-European languages.
首先，要让人口流动变得更容易。
由于更多人口流动铁路也越造越多。
As more people were going around, more railways had been built.
因此人口流动不是什么新鲜事儿。
这主要是由于拉丁美洲与世界其它地方之间的人口流动。
This is due mainly to population mobility between Latin America and the rest of the world.
然而，增长格局再平衡要求调整人口流动模式。
However, a rebalanced pattern of growth requires adjustment to the migration pattern.
盐在人口流动和世界探险中也起到了重要的作用。
Salt also played an important part in population movement and world exploration.
人口流动是一种自然而正常的经济社会生活现象。
Population mobility is a natural phenomenon of economic and social life.
目前，由于非洲人口流动日益加剧，黄热病免疫接种益发重要。
Immunization against yellow fever is all the more critical now because of increased population movements in Africa.
但是对于其他地方来说，人口流动减缓只能带来痛苦。
But elsewhere, falling migration means little more than pain.
一个领先的国家需要检测沙尘暴，测量大米产量，和跟踪人口流动。
A given country might want to monitor dust storms, measure rice yields or track population migrations.
取消人口流动限制仍能改善不平等，虽然不能全面改善。
Removal of migration barriers is again inequality improving but less so.
本文从社会学角度对农村人口流动和村庄治理进行了界定。
This movement from a sociological point of view of the rural population and village governance should be defined.
因此，这里有必要对乡城人口流动对生育行为的影响做一分析。
So, it is necessary to analyze the effect of rural-urban mobility on reproductive behavior.
雨季等季节性因素以及该地区的人口流动造成这一极不寻常的霍乱高发病率。
Seasonal factors, such as the rainy season, along with population movements in the area contribute to this unusually high incidence of cholera.
然而，正如重庆所展示的，要维持这种人口流动正变得越来越困难。
Yet, as Chongqing also shows, maintaining this flow of people is becoming increasingly tricky.
他强调，今天，国家需要一个有力的政策以满足因工作需求而产生的人口流动。
Today, he argues, the country needs a policy fit for a world in which people move often for work.
富有讽刺意味的是：经济萧条减缓了人口流动反而对加利福尼亚州有利。
Slowing migration has, ironically, helped California, among the most economically battered of states.
医院暴露、与麻疹病人接触、人口流动是本次麻疹传播的重要危险因素。
Hospital exposure, contact to measles patients and floating population were risk factors which made this disease spread.
取消户口限制对人口流动的影响的限制是很小的，但是仍然是很重要的。
The impacts of removing Hukou restrictions on migration are smaller, but are still significant.
接着我们对模型作了一个延伸：城市住房价格的增长延缓了城乡人口流动。
We then present a further model extension in which urban house price rises retard rural-urban migration.
人们经常使用供应短缺或人口流动来解释高房价，但是这些基本因素也会推动房租上涨。
Scarcity of supply or population shifts are often used to rationalise high house prices, but such fundamentals should push up rents, too.
强降雨雨季等季节性因素以及该地区增多的人口流动造成这一极不寻常的霍乱高发病率。
Seasonal factors, with a particularly heavy rainy season, along with increased population movements in the area contribute to this unusually high incidence of cholera.
根据现有资料和作者的实地调查，在现阶段，农村人口流动的影响和后果是十分复杂的。
According to available information and the author's field investigations, at this stage, the impact and consequences of rural population flows is very complex.
与此形成鲜明对比的是2000年到2001年。人口流动率从15%以上降至不到14%。
Between 2000 and 2001, in contrast, the migration rate fell from over 15% to under 14%.
与此形成鲜明对比的是2000年到2001年。人口流动率从15%以上降至不到14%。
Between 2000 and 2001, in contrast, the migration rate fell from over 15% to under 14%.
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