The solution to the problem remains unfound.

这个问题的解决方案仍然未发现的。

Many mysteries in the ocean are still unfound.

海洋中仍有许多谜团未发现的。

The artifact was unfound until the recent excavation.

直到最近的挖掘，这件文物才被未发现的。

The treasure remains unfound despite numerous searches.

尽管进行了多次搜索，宝藏仍然未发现的。

Some species in the rainforest are still unfound by scientists.

雨林中有些物种仍然是科学家们未发现的。