The flying saucer is yet an unsolved mystery.
飞碟仍然是未解之谜。
议的东西;The flying saucer is yet an unsolved mystery.
飞碟仍然是未解之谜。
And keeping the satellite's huge beam and the distant rectenna reliably synced up also stands as an unsolved technical issue.
而
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，也是一个尚未解决的技术难题。
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?
另外还有一类「极小」的问题也还没有解决：在保证有唯一解的条件下，一个初盘至少需几个数字？
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