As a system administrator, you run across numerous challenges and problems.

作为一名系统管理员，您可能碰到过各种各样的挑战和问题。

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No country, not even a powerful country like the United States, can tackle all the challenges and problems alone.

要应对诸多的挑战和问题，靠各国、哪怕像美国这样最强大的国家单打独斗也越来越不行了。

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America's status in the 21st century will also be strongly influenced by the way we address our internal challenges and problems.

我们如何处理内部挑战和问题，也将对美国在21世纪的地位产生重要影响。

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we've got seven or eight big problems." And as he took on those challenges, a presidential style emerged.

VOA: standard.2010.01.16

"President Obama embodies the new spirit of dialogue and engagement on the world's biggest problems: climate change, nuclear disarmament and a wide range of peace and security challenges,".

VOA: standard.2009.10.09

"Over the 90 percent of the more than 3,000 polling stations, fixed and mobile,countrywide opened on time this morning and no logistical problems or challenges worth mentioning were experienced,".

VOA: standard.2009.11.28

The 21st century is marked by serious security threats, serious economic challenges and serious problems, from AIDS to global warming to the continuing turmoil in the Middle East.

CNN: Clinton: Time again to choose a more perfect union

Those that are elderly and have problems and challenges, those that are disabled, we care for them.

WHITEHOUSE: The White House

They spent even less time talking about what plans they had to actually meet these challenges and solve these problems.

WHITEHOUSE: Remarks by the President at a Campaign Event -- Boulder, CO