unsolved

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On the other hand, the transparent linking of wired and wireless networks is an unsolved problem.
另一方面，有线和无线网络间的透明连接是一个尚未解决的问题。
One big Extra in any endeavor is to identify new opportunities or unsolved problems, and then convene conversations around them.
任何努力中的一个大的额外因素就是确定新的机遇或没有解决的问题，然后召集他们谈话。
Some researchers regard sleep as one of the greatest unsolved mysteries of science, even though all animals do it in one form or another.
有些研究者将睡眠认为是科学中一大未解之谜——虽然每一种动物都会睡觉，以这种或那种的形式。

It was a problem left unsolved by the out-going president.
Problems like the artificial heart are still unsolved, there's still room for innovation, still room to learn from what hasn't worked before, to learn from science, and to design something better.
人工心脏技术中存在的问题还没有解决,还有创新发展的空间,仍有从未涉足的领域来研究,通过对科学原理的学以致用,去设计出更好的产品
耶鲁公开课 - 生物医学工程探索课程节选
Finally,there's a section that talks more about the unsolved mysteries and particularly the role that the Large Hadron Collider would play in that."

The case remains unsolved, and charges were never brought against Amy or her husband.
NEWYORKER: A Loaded Gun