相关单词近义词 period 一段时间, Old-Fashioned 老式的, dated 过时的, historical 与历史有关的..., ex post facto 事后地, retroactive 有追溯力的临近词retroactive, retrieve, Retrou, retron, Retrone, Retrosi, retrovit, retrofit, retrorse, retrogen, retroact, retroene 返回 retros