knownadj.已知的;有名的动词know的过去分词.
known world已知的世界
known apartv.认出其间的差异
knownothingn.一无所知的人(不可知论者)adj.一无所知的(不可知论的)
known aboutv.知道关于 ... 的情况
known signal确知信号
known damage已知破损
known danger[法] 已知危险
known sample已知样品
known factor已知因素
known numbern.已知数