opev.开放;自由进出(动词open的古体)=open.
operon theory操纵子说,操纵子学说
Opel Frontera欧宝前卫,简称前卫
opercular tag鳃盖标志
opercular sac鳃囊
operculectomy牙冠龈盖切除术
operculum pori孔盖
opercular bone鳃盖骨(动)
opercular cell囊盖细胞
opercular gill盖鳃
operon concept操纵子概念