Opeln.欧宝（德国汽车品牌）opev.开放；自由进出（动词open的古体）=open.operculum orbitale岛盖额部operculum syndrome被盖综合征opereative therapy手术治疗operculum laryngis喉盖oper-ating panel控制盘, 操纵盘operculum frontale额叶岛盖oper-type bearing非密封轴承operstion infection感染Operophtera brumatan.秋尺蛾operculum genetalis生殖厣