operaria职虫(膜翅目)operan.歌剧n.挪威Opera软件公司的浏览器软件operating over-voltage操作过电压operating characteristic运行特性operating mode condition工况条件operating charcteristics工艺性能opera bitangent Evidence二重证据法operating system monitor操作系统监控程序,操作系统监督程序Operating Cost Authority作战费用权限Operating Location Clerk作战场所职员opera amateur performers戏剧票友operating pressure angle实际压力角

1. Change before you go to the opera.
   在去歌剧院前，你要换衣服。