an unsolved mystery.
开的谜团。
答的,决的决的;决;决办法;予答复的;an unsolved mystery.
开的谜团。
The flying saucer is yet an unsolved mystery.
飞碟仍然是之谜。
And keeping the satellite's huge beam and the distant rectenna reliably synced up also stands as an unsolved technical issue.
而要使卫星发射出来的巨大微波束与地面的网格形天线一直保持同步，
是一个尚决的技术难题。
Another problem of minimality also remains unsolved—to wit, what is the smallest number of digits a puzzle maker can place in a starting grid and still guarantee a unique solution?
另外
有一类「极小」的问题
有决：在保证有唯一的条件下，一个初盘至少需要几个数字？
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