an unsolved murder/mystery/problem
未破案的谋杀事件；未解开的谜团；未解决的问题
1.未解释的;未解决的
1.an unsolved problem or mystery is one that you have not dealt with or explained; used about crimes when the criminal has not been found
1.This problem has lasted for a century and a half. As long as it remained unsolved, it cast a shadow over the relations between us.
香港问题已经有近一个半世纪的历史，这个问题不解决，在我们两国和两国人民之间总是存在着阴影。
2.As one of the four questions left by the theory of relativity by Einstein, the theory of unified field is still unsolved.
统一场理论，它是目前许多国家理论物理界所研究的尚未解决的问题，它是爱因斯坦相对论中所遗留下来的四个问题之一。
3.Pancreatic cancer is one of the most lethal human cancers and continues to be a major unsolved health problem.
胰腺癌是癌症中最致命的一种，同时，作为一个主要的健康问题，依然没有得到良好的解决。
4.Life itself is an unsolved mystery, said the clergyman gravely.
“生活本身就是一件尚未解决的神秘案件”教士严肃的说道。
5.Nevertheless, one of her main problems still remains unsolved: landing a stable job.
然而，她的主要问题仍未解决，那一份稳定的工作。
6.The nature of our reality is part of an unsolved puzzle that humanity has quested after since the this cycle of time began.
我们实相的属性就是自从这个时间周期以来人类寻求的未解决迷题的部分。
7.Just this afternoon, Google declared real-time search to be one of the biggest unsolved challenges it faces.
今天下午Google宣布即时搜索是Google目前面临的主要未决问题之一。
8.The market mood of recent weeks might be better but the problems remain unsolved and there is the risk of a wider political backlash.
近几周市场情绪可能有所好转，但问题还是没有得到解决，政治上有可能面临更大范围的抵制。
9.As of yet, none of the paintings have been found and the case is still unsolved .
截至但一直没有找到与画案仍悬而未决。
10.Analytic number theory is fortunate to have one of the most famous unsolved problems, the Riemann hypothesis.
解析数论非常幸运还有一个最为有名的未解决的问题，即黎曼假设。