Known， Known-unknown， Unknown-unknown
Unknown-unknown
未知的不确定因素不可知的未知因素
已知的确定的已知的不确定因素
Abortion with unknown reasons
aggressive equation of three unknown factors
Ascites of unknown origin
bounded-but-unknown uncertainty
Broadcast and Unknown Server
BUS Broadcast and Unknown Server
cancer of unknown primary site
Carcinoma of Unknown Primary Site
Chronic liver diseases of unknown etiology
Deaths from an unknown cause
deduce unknown side from known side
Estimation of unknown function
examination of unknown solids
Fever of unknown origin
发热,不明原因
发热,原因不明
不明原因的发热
不明原因发热
不明热