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。
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。
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。
The population control is in the sense of keeping simultaneously the quantity of population in a moderate size to enlarge the quality of population continuously.
人口控制就是把人口数量控制在一个适度的范围内，同时不断提高人口质量。
Some technical measures were used in the breed control of Hequ horse, such matters as defining conservation region, determining effective population size and having a right foundation herd etc.
河曲马品种的保种与选育，应采取划定保护区，建立育种核心群，确定群体有效含量，控制近交，调整马群结构和合适的公母比例等措施；
The State adopts a comprehensive measure to control the size and raise the general quality of the population.
国家采取综合措施，控制人口数量，提高人口素质。
The State adopts a comprehensive measure to control the size and raise the general quality of the population.
国家采取综合措施，控制人口数量，提高人口素质。
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