The second major challenge in addressing climate change is the complexity of the science itself.

应对气候变化的第二个主要挑战是科学本身的复杂性。

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The second major organizational challenge is with promoting top technical talent, which quickly gets into which characteristics are most important.

第二大组织上的挑战是提升顶尖的技术人才，这很快变成了解哪些特征最重要。

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A teacher in Wu Han University expressed her idea: "The students choosing a second major have the courage to challenge themselves. I appreciate it very much."

武汉大学的一位老师表达了她的看法：“那些选择双学位的同学有勇气挑战自我，是值得赞赏的。

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The second major challenge in developing useful LEIs is achieving international consensus.

FORBES: Legal Entity Identifier (LEI) ID Code for Banks and Subs Delayed Until 2012

It is Alan's second major challenge in the past few years.

BBC: Alan Rankin on his yacht Trade Winds

In the second part of the debate, John Swinney told the chamber the budget settlement had been a "major challenge" so far due to a "tight financial settlement" from Westminster.

BBC: Finance Committee Budget debate 1