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，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，一个初盘至少需要几个数字？
The unsolved mystery baffled investigators for years.
这个未解之谜困扰了调查人员多年。
There are many unsolved problems in the field of science.
科学领域中有许多未解之谜。
The case remains unsolved despite extensive investigations.
尽管进行了大量调查，但这个案件仍未解决。
The unsolved crime haunted the small town for decades.
这起未解之案困扰了小镇数十年。
The unsolved puzzle left everyone scratching their heads.
这个未解之谜让每个人都百思不得其解。
The unsolved murder case was reopened after new evidence came to light.
新证据浮出水面后，这起未解谋杀案被重新调查。
The unsolved equation stumped even the most brilliant mathematicians.
这个未解方程连最聪明的数学家都束手无策。
The unsolved disappearance of the hiker sparked widespread concern.
这名徒步者的失踪案件引发了广泛关注。
The unsolved riddle continued to perplex scholars for generations.
这个未解之谜继续困扰学者们数代。
Despite numerous attempts, the code remained unsolved.
尽管有过多次尝试，这个密码仍未破解。
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，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，一个初盘至少需要几个数字？
The unsolved mystery baffled investigators for years.
这个未解之谜困扰了调查人员多年。
There are many unsolved problems in the field of science.
科学领域中有许多未解之谜。
The case remains unsolved despite extensive investigations.
尽管进行了大量调查，但这个案件仍未解决。
The unsolved crime haunted the small town for decades.
这起未解之案困扰了小镇数十年。
The unsolved puzzle left everyone scratching their heads.
这个未解之谜让每个人都百思不得其解。
The unsolved murder case was reopened after new evidence came to light.
新证据浮出水面后，这起未解谋杀案被重新调查。
The unsolved equation stumped even the most brilliant mathematicians.
这个未解方程连最聪明的数学家都束手无策。
The unsolved disappearance of the hiker sparked widespread concern.
这名徒步者的失踪案件引发了广泛关注。
The unsolved riddle continued to perplex scholars for generations.
这个未解之谜继续困扰学者们数代。
Despite numerous attempts, the code remained unsolved.
尽管有过多次尝试，这个密码仍未破解。
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