英语翻译
asweknow,thereareknownknowns;therearethingsweknowweknow.Wealsoknowthereareknownunknowns;thatistosayweknowtherearesomethingswedonotknow.Buttherearealsounknownunknowns--theoneswedon'tknowwedon'tknow."DonaldRumsfeld
此网友是国外的叫Hill在bbs.keyhole.com/
假大空是什么是意思