What if a newspaper describes a politician as a dark horse? This means nobody knows much about him.

　　要是报纸把某一政客描述为dark horse呢？这说明“没有人很了解他”。

　　例句：Our congressman had been in Washington 20 years and thought we‘d keep voting for him forever. This year, though, the other party nominated a dark horse out of nowhere. He kept telling voters it was time for a change and he won the election.

　　我们的国会议员已经在华盛顿二十年了，他以为我们会永远投他的票。然而，今年另一个党提名了一个不知从那儿冒出来的人，谁也不认识他。他不断地告诉选民，现在是进行改变的时候了。结果他当选了。