As yet a challenge to explain the cause-and-effect relationship between sleep and nutrition, there may be a third factor that impacts both of them.

要解释睡眠和营养之间的因果关系，还有一个挑战，那就是可能有第三个因素对它们两者都有影响。

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It's as yet a challenge to explain the cause-and-effect relationship between sleep and nutrition. There may be a third factor that impacts both of them.

迄今为止，解释睡眠和营养间的因果关系仍是一个挑战。可能存在第三个因素影响这两者。

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Coping with PTSD symptoms and the problems they cause is usually a continuing challenge for survivors of trauma.

对于灾难幸存者而言，应对PTSD症状及其引发的种种问题，通常是一个持续不断的挑战。

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Few will disagree that monocultures, thanks to the wide deployment of a single code base, rife with vulnerabilities, is the single biggest cause of the cybersecurity challenge.

FORBES: New Cybersecurity Focus For Federal R&D Group

And that only reinforces the need to aggressively do the things that we here in Washington can do to help insulate our economy from the kinds of shocks globally that can cause -- create a challenge for the economy.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Although larger ships would cause more environmental damage and create an enormous rescue challenge in case of an accident, they also offer greater comfort and more amenities.

BBC: Planning your dream Antarctic vacation