相关单词同义词either, ossia, 近义词 else 其他, conversely 相反地, otherwise 否则, optionally 可选择地, alternatively 二者择一地, contrarily 反之, operating theater 手术室, operating room 手术室, Beaver State 河狸州(俄勒冈州的别名)..., surgery 外科手术, operating theatre 手术室, Oregon 俄勒冈（美国州名）...反义词nor, 也不临近词oracle, opus, orf, ory, ork, ORV, Ora, Orm, ORP, orz, orlo, Oric相似词optional, optometrist, opulent, opus, or die in the attempt idiom, or else idiom, or no idiom, or otherwise idiom, 返回 or