unsolved /ˌʌnˈsɑːlvd/ adjective Learner's definition of UNSOLVED
: not yet solved : never solved尚未解决的；从未破解的 -
an unsolved crime未侦破的犯罪活动
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one of science's great unsolved problems科学尚未解答的重大难题之一
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The case remains unsolved.这个案子仍然未破。
— unsolvable
/ˌʌnˈsɑːlvəbəl/ adjective