What's this then, you're only drinking orange juice - have you signed the pledge or something?这是怎么回事？你只是在喝橘子汁——你是发过誓不再喝酒了，还是其他什么原因？She was bursting to announce the news but was sworn to secrecy.她急不可待地想宣布这个消息，但她发过誓要守口如瓶。The judge reminded the witness that he was still under oath.法官提醒证人，他是发过誓的。