Control villages resembling project villages in terms of population size were randomly selected from an area enclosed by two ellipses centred around, but not including, the project area.

从由两个椭圆围绕封闭而成的区域中随机抽取与项目村庄拥有类似人口规模的对照村庄，但不包括项目区域。

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The researchers said findings suggest that in future it might be possible to control the size of the malaria-carrying mosquito population by introducing a genetic change that makes males sterile.

研究员称该发现表明，未来有可能采用基因转变以使雄蚊无生殖力来控制携带疟疾病菌蚊子的数量。

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The smaller family size is mainly due to the positive results of population control.

家庭户规模缩小，主要是人口控制所产生的积极效果。

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Libya's population is a quarter the size of Iraq's, and the country should be easier to control: almost all its people, a more homogeneous lot albeit with sharp tribal loyalties, live along the Mediterranean coastal strip.

ECONOMIST: The challenge of Libya