In his book Outliers, Malcolm Gladwell suggests that becoming an expert in any particular field takes approximately 10, 000 hours of practice.

在《异族》(Outliers)一书中，作者Malcolm Gladwell建议成为一个专家(高手)在通常情况下需要花费近10000小时的练习与实践。

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Tom is a specialist in this particular field, so if you want any help, he can point you in the right direction.

汤姆是这一特定领域的专家，所以如果你需要帮助，他可以为你指出正确的方向。

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The fishermen know the approximate time of year when they will be allowed to fish, but on any given day, one or more field biologists in a particular area can put a halt to fishing.

渔民们知道一年中允许捕捞的大概时间段，但是在某些日子，一个地区可能有一个或多个实地生物学家中止捕鱼活动。

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Another crucial question is whether any of the main Palestinian militant groups will enter the political process and field a presidential candidate in particular Hamas, whose popularity has risen as the PA's has slumped.

ECONOMIST: Can Palestinians go from bullets to ballots? | The