Unexplained bleeding不明原因的出血
Unexplained Absences无故旷课
unexplained puzzle不解之谜;不解之迷
Unexplained cough使用不明原因的咳嗽
unexplained loss不明损失
Unexplained Structures无法解释的建筑物
unexplained sterility不明原因不孕症
unexplained parallels难以解释的相似
Unexplained Wounds无法解释创伤
The further study should continue on the unexplained postoperative haze of individual patients.
个别患者在术后发生不明原因的迟发性haze有待于进一步研究。
参考来源 - 去上皮瓣EpiADJ（形容词） If you describe something as unexplained, you mean that the reason for it or cause of it is unclear or is not known. 原因不明的
An unexplained death is difficult to come to terms with.
原因不明的死亡是难以接受的。