短语词组短语over -lap type hatchc 背载型舱口盖Over -lap Trade 重叠贸易;或重叠贸易front over lap 叠门over lap positive lap 正重迭overlap ratio 纵向重合度；重叠比overlap joint 搭接接头；重迭结合overlap region 重叠区；重叠区域 返回 over lap