O字开头的单词或词组
opineobfuscateophthalm-office buildingoverboardOsageon the edge ofoutward-boundoff seasonozoneon the roadon the rocksObsoutlayoversleptoo-overweighon requestoverfisholivineoutwardlyOPECoriginatingoutworkon the part ofopportunity costoffbeatoverflyon accountoiledodourlessof a kindon the declineobsessive-compulsiveoringone-to-oneovationon lineoperabilityopen fireorchestrationoffence
