subsubpopulationWiktionary 原文构词拆分sub-前缀Under, beneath. · Subsidiary, secondary.+subpopulation词根/词干词源说明From sub- + subpopulation.释义（英文）名词 NounA subset of a subpopulation (as for example in epidemiology).词族相关词（3）subsubdomainsubsubspeciessubsubtype