A solution requires solving the hardest known problems in the universe, often requiring years (if not decades) of effort
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An important note is that the number of times a letter is highlighted from previous guesses does necessarily indicate the number of times that letter appears in the final hurdle.
（六）扰乱大型群众性活动秩序的其他行为。
（三）后处理，是指对反应堆乏燃料进行处理，以分离其中的裂变产物，并回收可裂变物质的过程。