He chose such parts, not always for the best, because the role of anti-hero was a challenge and an act of defiance.

他之所以选择这些角色并非总是为了最好，而是因为出演反英雄的角色是一个挑战，一种反抗的行为。

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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.

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。

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The best use for it is to stand as a challenge and a departure point to make a better model. A real predictive model of a planetary society would

利用它的最好方式，是把它看成一个挑战，是建立更好的模型的一个新起点。

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All the information is available free, and there's a Challenge Prize for the best use of it.

WSJ: A New Wave of Ocean Explorers | Marvels

Accepting this inevitability, the challenge for Japan will be to make the best of a highly problematic situation.

FORBES: What Life Will be Like in a China-Run Neighborhood

Instead, the challenge for the NHS is how to best manage these patients to allow them to live independent and healthy lives and, as a result, keep them out of hospital.

BBC: The changing health service