the study of methods of improving genetic qualities by selective breeding (especially as applied to human mating)
eugenics详细解释
eu.gen.ics n.(used with a sing. verb)（名词）（与单数动词连用）The study of hereditary improvement of the human race by controlled selective breeding.优生学：通过可控制选择性生育来对人种进行遗传学上的改善的研究
