the study of the operation of factors causing degeneration in the type of offspring produced
同义词：cacogenics
dysgenics详细解释
dys.gen.ics n.(used with a sing. verb)（名词）（与单数动词连用）The biological study of the factors producing degeneration in offspring, especially of a particular race or species.劣生学：以种族退化为研究对象的一门生物学学科，尤指一定的种族或种属
