短語詞組短語progressive offlap 漸進退覆;前進退覆offlap sequence 退覆層序marine offlap 海上退覆offlap p 退復(fù)staggered offlap 階段退覆regressive offlap 退覆simple offlap 簡單退覆offlap fault 平移斷層offlap slope facies 退覆斜坡相 返回 offlap