nonbookn.无真实价值的书(常指图片集、剪报集、演讲集等)nonadv.[拉]非；不是non-tratified form不分层树型non-English majors非英语专业non-control filter非控制性反滤noninterlocked lever非联锁握柄nonagricultural jobs就业非农化Non-computerMajors非计算机专业nonsynchronous timer异步定时器non-liaison octave非连音八度non-refund annuity非偿还性年金nonreplacement model不可替换模型