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相似词retribution, retrievable, retrieve, retriever, retroactive, retrofit, retroflex, retrograde, 返回 retro