In recent years the problems which are caused by the inequality of education opportunity have attracted the public's attention.

近年来，由教育机会不平等引起的问题引起了公众的关注。

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And operational downtime caused by reliability or performance problems can incur opportunity costs if customers are unable to access your system or the business is unable to do its work.

并且如果顾客不能访问你的系统或业务不能进行工作，那么由可靠性或性能问题引起的运作停工就会招致机会成本。

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More broadly, if we are serious about addressing our national energy problems, these advances have given the U.S. a unique opportunity to realize large gains for both the environment and the economy.

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