The use of the Egyptian pyramids is still an unsolved question.

埃及金字塔的用处至今是个未解之谜。

With this problem unsolved, the next step is far from progress.

这个问题还未解决，下一步进展遥遥无期。

We will deal with the unsolved issue next time.

我们下次再处理未解决的问题。

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。

It is one of the great unsolved mysteries of this century.

这是本世纪尚未解开的大奥秘之一。

The invention of the vertical file remains an unsolved mystery.

立式文档的发明文件仍然是一个未解之谜。

Unsolved for most people anyway.

至少对于大部分人来说，这是没有结案的。

These are pressing, unsolved questions.

这些都是棘手的尚待解决的难题。