份属美国援助系统的千年挑战公司的约翰•修克指出，并没有单一的最佳定义；这全取决于你之所需。

John Hewko of the Millennium Challenge Corporation, part of America's aid-giving system, points out that there is no single best definition; it all depends on what you want it for.

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如果那些穷国能计划好如何使用他给的款项的话，他的千年挑战公司(MCC)将会给那些国家这样一笔钱。

His Millennium Challenge Corporation (MCC) gives poor countries money if they can come up with a good plan for what to do with it.

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这家公司今后几年将面临重大的挑战。

The company faces major challenges over the course of the next few years.

《牛津词典》

And that created enormous challenges, of our capability and systems and process to deal with this tremendous growth and expansion.

这也为我们带来了极大地挑战，公司的能力和机制与,快速的成长和扩张不符。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选