Resilient people who think positively tend to treat every problem as a challenge, a chance for improvement of any kind, or as an opportunity for personal growth.

有韧性的人怀着乐观思维，往往把每一个问题都当作挑战，当作任何一种改进的机会，或者当作个人成长的机会。

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As a new student he quickly picked up on the challenge laid out by Boneh to tackle the problem of homomorphic encryption.

作为一个新生，他很快就熟悉了Boneh教授布置的挑战，即解决同态加密技术的难题。

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Trafficking represents a new challenge to law enforcement, especially in regions which have traditionally not thought of it as a major problem.

非法交易活动对执法机关提出了新的挑战，尤其在那些一般不太重视该问题的地区。

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What makes Linda Parker Hudson different from the rest of us is that she sees every challenge as a problem to be solved, and is confident she can solve it.

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The U.S government needs to pay serious attention to these developments in Central America not only as a criminal problem but as a serious national security challenge.

CENTERFORSECURITYPOLICY: Guatemala: A security challenge

When we frame everything from the difficult to the life-threatening as a challenge to be met rather than as a threat to avoided or confronted, we just naturally tackle the problem before us.

FORBES: Consider Negotiation a Challenge to Get a Better Deal