名词
中文翻译：难题
同义词：
['tangle', 'puzzle', 'enigma例句：1. The conundrum of the missing information is still unsolved.（缺失的信息仍然未解之谜。）']
例句：
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1. The conundrum of the missing information is still unsolved.
缺失的信息仍然未解之谜。
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2. He spent hours trying to solve the conundrum of the mystery.
他花了几个小时试图解决这个谜团。
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3.The conundrum of the situation was that it was impossible to find a solution.
情况的谜团在于找不到解决方案。