dark horse

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Robert Shiller of Yale University recently singled out farmland as “my favourite dark-horse bubble candidate for the next decade or so”.
最近耶鲁大学的罗伯特•席勒指出，农田是“我认为在今后十余年最有可能产生泡沫的领域。”
In 2011 he will work on those weaknesses, emerging as an attractive dark-horse candidate and (again) as a plausible running-mate for the eventual nominee.
2011年大选，他将克服这些弱点展现他的光辉成为一匹夺人眼球的黑马，并（再一次）理所当然地成为最终获选的提名者。
ASK Jamie Dimon if he wants to be America’s next treasury secretary, a job for which the head of JPMorgan Chase (JPM) is a dark-horse candidate, and he clams up.
现任摩根大通（JPM）总裁的杰米•戴蒙很意外地成为了下一任美国财政部长的候选人。当被问及是否愿意担此大任时，他就三缄其口。

In politics,a dark-horse candidate is someone who is not well known to the public.

Coming in first place, by the way, in the bedandbreakfast.com pancake competition is a long-shot, dark-horse entry: a lemon-blueberry ricotta-cheese pancake with a sweet lemon sauce, garnished with fresh strawberries.
NPR: Washington Experience a Liability for Democrats?
But the underperformance of so many of the world's soccer powers--pre-tournament co-favorites Argentina and Italy, defending champion France and dark-horse favorite Portugal were all eliminated in the first round--diminished the tournament as a showcase of the world's top footballing talent.
FORBES: Magazine Article
In the meantime, bid farewell to your dark horse team after the second round--of the 20 teams seeded 12th or lower that have reached the final 16, only one has ever taken the next step to the Elite Eight.
FORBES: Magazine Article

(SECRET) a person who keeps their interests and ideas secret, especially someone who has a surprising ability or skill
(WINNER) a horse or a politician who wins a race or competition although no one expected them to

If you describe someone as a dark horse, you mean that people know very little about them, although they may have recently had success or may be about to have success.