当然，阿富汗战事结束并不意味着对我们的安全的挑战的结束。

Of course, the end of our combat mission in Afghanistan doesn't mean the end of challenges to our security.

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电脑黑客活动已形成重要威胁； 信息基础设施面临网络安全的挑战；

Computer hacker activity has formed an important threat. Information infrastructure facilities are facing the challenge of network security.

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他们发现，低收入家庭的学生更难以获得入学机会，因为交通、非名义上的费用和校外安全对他们都是挑战。

They find that low-income students have less access due to challenges with regard to transportation, non-nominal fees, and off-campus safety.

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