Other messages generate a special challenge response to the sender.

其它消息会产生一个特殊的质询(challenge)响应给发送者。

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This is a grand challenge for our age and it may require an "irrational" response.

这是我们这个时代面临的重大挑战，为此可能需要“非理性”的回应。

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"The challenge right now is that our emergency pre-positioned supplies were running quite low because the response in West Java was in progress still and that quake had just happened a few weeks ago,"

VOA: standard.2009.10.01

The natural challenge-response we all have in us is what will be the biggest help to the new amputees.

CNN: Amputees never say 'I can't'

The community has large Hispanic and Vietnamese populations, which result in language barriers and cultural considerations that challenge our disaster response and community preparedness efforts.

WHITEHOUSE: Creating Community Resilience

Challenge: Media response to war .

CENTERFORSECURITYPOLICY: The past, and the present