相關單詞近義詞 period 一段時間, Old-Fashioned 老式的, dated 過時的, historical 與歷史有關的..., ex post facto 事后地, retroactive 有追溯力的臨近詞retroactive, retrieve, Retrou, retron, Retrone, Retrosi, retrovit, retrofit, retrorse, retrogen, retroact, retroene 返回 retros