相关单词近義詞 period 一段時間, Old-Fashioned 老式的, dated 過時的, historical 與歷史有關的..., ex post facto 事後地, retroactive 有追溯力的臨近詞retroactive, retrieve, Retrou, retron, Retrone, Retrosi, retrovit, retrofit, retrorse, retrogen, retroact, retroene相似詞retribution, retrievable, retrieve, retriever, retroactive, retrofit, retroflex, retrograde, 返回 retro