High availability, the requirement to protect a production-grade application against a failure of any node, isn't a new concept by any standard; many software products address this challenge.

高可用性—避免一个生产级应用程序在任何节点上发生故障的要求—对于任何标准而言都不是什么新概念；许多软件产品都致力于解决这个问题。

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"One challenge we face is that we call ourselves group dating," said Sachs. "There's a stigma or taboo about the concept of dating that makes people cautious."

“我们面临的一个挑战是把自己称为集体约会，”Sachs称，“约会这个概念与污名和禁忌有关，容易让人产生警觉。”

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Taub considers Robonaut2 a concept demonstration, analogous to what the company proved when its robotic Chevy Tahoe, Boss, won the DARPA Urban Challenge in 2007.

托布将R2视作一次概念验证，如同其公司的机器人雪佛兰Tahoe Boss所证明的一样，2007年Tahoe Boss赢得了美国国防部高级研究计划局（DARPA）举办的城市挑战赛（Urban Challenge）。

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But you know, I understand it's a challenge when you're coming from a language that doesn't have any concept of an article.

但是，我能够理解当你的母语没有冠词的概念时，它将是一个挑战。

经常犯的失误 - SpeakingMax英语口语达人

According to a report by the New Media Consortium (NMC), the concept of Challenge-Based Learning was developed in late 2008 by a group of educators working in concert with Apple Computer.

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That's the concept behind the Global Good Challenge, a new initiative to grab the Facebook generation's attention.

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Perhaps a new kind of competitor will emerge to challenge the big box concept.

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