sixty-four-dollar question

• n. 关键问题；最重要的问题

例句

用作名词 (n.)

1. The key question of what caused the leak remains unanswered.
   泄漏究竟是怎么造成的，这一关键问题仍未得到答案。
2. The biggest question is how they got into this mess in the first place.
   关键问题是他们是怎么惹出这样的麻烦的。
3. The discussion centres on the most important question.
   讨论集中在最重要的问题上。
4. Economic work is a political task of prime importance and the economic question is an overriding political question.
   经济工作是当前最重要的政治工作，经济问题是压倒一切的政治问题。

词汇搭配

• the sixty-four dollar question 最难答的问题,最重要...