他们是在罗马侵略前建立的，那时人口急剧增长，农场主急需保护， 无论是最初的个人保护还是后来的群体保护。
They were built in the centuries before the Roman invasions, when population pressure was most intense and farmers had growing need of protection, first from the elements, but later from each other.
超过退休年龄的人口的比例在过去几年中已急剧增长。
The proportion of the population who are over retirement age has grown tremendously in the past few years.
自然界规定了谁的储量是固定的，与此同时，伴随着世界人口的的急剧增加，水的需求量也就不可避免的迅猛增长。
Nature has decreed that the supply of water is fixed. Meanwhile demand rises inexorably as the world's population increases and enriches itself.
在过去的几十年，德黑兰人口快速增长，因此对住房的需求急剧增加，从而导致土地价格高涨。
During the last decades Tehran population has grown enormously, as a consequence demand for housing has increased dramatically leading to high land prices.
世界人口数量急剧增长，人口倍增时间大为缩短。
World population increases sharply and double time shortens greatly.
随着世界人口的持续高速增长，建筑体系消耗的能量急剧增加。
With the fast rising for world population, energy for building increased rapidly.
我们的人口和我们对地球上的有限资源的利用，都在急剧增长。同时增长的还有我们改造环境的技术水平，无论这种改造是好是坏。
Our population and our use of the finite resources of planet Earth, are growing exponentially, along with our technical ability to change the environment for good or ill.
世界总人口在1950至2000年间急剧增长。
Total world population increase sharply during 1950 to 2000.
在全球化迅猛发展的当今，人口流动急剧增长。
Under the rapid development of globalization, there is a pace-fast increase in the flowing of world population.
历时近三百年，东北地区人口数量规模发生了巨大变化，尤其到中后期人口数量急剧增长。
During nearly 300 years, the enormous change had taken place in the scale of population of the Northeast, especially in the middle and later periods the number of population had increased sharply.
历时近三百年，东北地区人口数量规模发生了巨大变化，尤其到中后期人口数量急剧增长。
During nearly 300 years, the enormous change had taken place in the scale of population of the Northeast, especially in the middle and later periods the number of population had increased sharply.
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