Just as how the AIDS epidemic seems to have overwhelmed medical scientists in the same way cancer has posed a great challenge also.

如同艾滋病让医学界的科学家们手足无措一样，癌症也向人们发起了了极大的挑战。

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Perhaps also you have found it a challenge finding exactly the information or type of assistance you needed to get your problem solved.

也许您还发现，找到解决您的问题所需要的确切信息或帮助类型充满了挑战。

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We should also recognize that we already have a huge challenge ahead of us because we're going to be feeding about 50 percent more people toward the end of the century, or more.

我们还应该认识到，我们已经面临着一项巨大的挑战，因为在本世纪末，我们要养活的人口是现在的一倍半，甚至更多。

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Patients who suffer from osteoarthritis and who also have a meniscal tear represent a challenge to medical providers because it is often not clear which condition is more adversely contributing to pain as well as their disability.

FORBES: Physical Therapy: A Reasonable Alternative to Surgery for Patients with Meniscal Tears and Arthritis

The Ospreys have also failed to mount a challenge for this season's Magners League title and there is much speculation about Jones's future in The Liberty Stadium hot seat.

BBC: Under-fire Jones defends Ospreys

You have done a nice job of describing how one type of manic episode looks, but in suggesting that what you see might be a temper tantrum you have also identified the challenge that faces us every time we try to give a name to psychiatric troubles.

CNN: Can a manic episode look like a tantrum?