Climate change is the common challenge faced by the mankind.

气候变化是人类面临的共同挑战。

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A common challenge is how to better manage the content used by these tools.

一个常见的难题是如何更好地管理这些工具所使用的内容。

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For example, a mother's maiden name is a common challenge question used by numerous sites.

例如，母亲的婚前姓是许多网站使用的验证问题。

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We face the common challenge of bringing debt under control while re-launching growth and creating new jobs.

WHITEHOUSE: President Obama Speaks on US-EU Summit with Herman Van Rompuy and President Jos�� Manuel Barroso | The White House

Social interaction is a common challenge for those with autism disorders, Ketts said.

CNN: The reality of finding a job with autism

One common challenge is to deliver satisfactory experiences to those waiting in line.

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