During the industrial revolution and populationexplosion of the 19th and 20th centuries, the demand for water rose dramatically.
在19世纪和20世纪的工业革命和人口激增期间,人们对水的需求急剧上升。
2
Family planning experts worry in particular about the future populationexplosion in Sub-Saharan Africa.
计划生育专家特别担心撒哈拉以南非洲地区未来的人口出现激增。
3
Additional social stresses may also occur because of the populationexplosion or problems arising from mass migration movements—themselves made relatively easy nowadays by modern means of transport.