O字開(kāi)頭的單詞或詞組
order fromoutward-boundobservanceobfuscateopineon the rocksOsageoverboardoff seasonObson the roadoversleptoutlayozoneoverweighoo-overfisholivineoutwardlyon requestopportunity costOPECon the part ofoffice buildingoutworkoverflyoriginatingodourlessof a kindon the declineoffbeatoringon accountobsessive-compulsiveoiledon lineovationoperabilityopen fireoxidative phosphorylationorchestrationonanism



















