subsubsectionWiktionary 原文构词拆分sub-前缀Under, beneath. · Subsidiary, secondary.+subsection词根/词干词源说明From sub- + subsection.释义（英文）名词 NounA subsection beneath another subsection.词族派生词（1）subsubsubsection相关词（4）subsubdomainsubsubpopulationsubsubspeciessubsubtype