Now, one hopes to solve the puzzle a different way: using a modified version of Newton's second law that would eliminate the need for dark matter altogether.

现在，有希望从另外一条途径去解决这个难题：通过对牛顿第二定律进行修正以后，排除了暗物质存在的可能性。

youdao

Macfarlane compares the puzzle to a combination lock.

麦克法兰把这个难题比作一把密码锁。

youdao

This has presented climate scientists with a puzzle.

这给气候科学家们带来了一个难题。

youdao

It's a total mystery,". He says brain studies are shedding light on the pieces of the puzzle and might one day solve the mystery.

VOA: standard.2010.01.15

there's a puzzle as to how are we even to understand this case?

就有这样一个疑团要解决,我们怎么理解这种案例？

耶鲁公开课 - 死亡课程节选

Or maybe we shouldn't call it a puzzle at all.

或者也许我们根本不应该叫它困惑。

耶鲁公开课 - 死亡课程节选

This is definitely an action game with a few puzzle elements, not a puzzle game with action elements.

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Likened to a huge jigsaw puzzle, a great many of the pieces have been put into place but not all of them, not yet.

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