Following some relief in Washington that Pyongyang's missile launch proved a failure, the threat to abandon the talks presents a formidable challenge to Obama.

平壤导弹发射被证实失败后，华盛顿方面多少有些宽慰，然而，随之而来的放弃会谈的威胁，却是献给奥巴马的一个难以应对的挑战。

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NASA hit the challenge hard. The space agency built a bird radar to scan for flocks that could fly through a shuttle?s launch path and pose an impact risk.

NASA下定决心要解决这一问题，宇航局建立了一座鸟类雷达，以扫描航天飞机发射路径上是否有可能造成冲撞的鸟群。

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It is estimated that the network will be able to launch a car within an hour of up to 5 TB of data, so the biggest challenge is how to monetize these data.

据估计，联网汽车在一个小时内就能发射高达5 TB的数据，因此目前最大的挑战在于如何将这些数据货币化。

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This helped lead to the launch of Challenge.gov, a one-stop clearinghouse that agencies can use to mount their own challenges.

WHITEHOUSE: Unleashing Innovation & Deepening Democracy Through Prizes | The White House

Kenny Logan and Roger Uttley were speaking to CNN at the launch of Logan's Challenge, a fundraising event for Sparks, the children's medical research charity.

CNN: Rugby greats say 2009 Lions can roar

Mayor Rahm Emanuel announced today the launch of the Chicago Broadband Challenge, a unique initiative that will engage the public to secure Chicago's position as one of the digital capitals of the country and the city with the greatest availability of ultra-high-speed broadband in the United States.

ENGADGET: Chicago mayor targets affordable gigabit broadband, free WiFi throughout city parks