英语翻译“A dark horse” is one that shows unexpected racing speed

英语翻译
“A dark horse” is one that shows unexpected racing speed and comes in first,even though the experts said he had little chance of winning.
In politics,an unknown candidate for office who wins a nomination or election is called “a dark horse”.
British Prime Minister Benjamin Disraeli is believed to have been the first to use the phrase.In his novel,The Young Duke published in 1831,Disraeli described a horse race and tells how top choices fell behind,while “ a dark horse which never had been though of rushed past the grandstand in a sweeping triumph”.
As a political phrase,“dark horse” appeared for the first time tin the national Democratic Party convention of 1844.The “dark horse” was James Knox Polk,who became the 11th President of the United States.As a national leader,he was considered a political nobody.Nevertheless,he surprisingly won the Democratic nomination and was elected President.This is what happened:
Martin Van Buren of New York,a former President seemed sure of getting the nomination.But he opposed making the territory of Texas part of the United States,anther state.He was against it because there was slavery in Texas.Van Buren did not want another slave state in the Union.As a result,he lost support among those Democrats who supported slavery.
At the 1844 convention,Van Buren could not get enough votes to win the nomination.The convention was deadlocked.Therefore,the Democratic leaders decided that the only wise thing would be to run a “dark horse”,a man who could unite the party.
And so,one of the party leaders,George Bancroft,proposed the name of James Knox Polk.He won,and the party united behind him.And he defeated his opponent,Henry Clay of the Whig Party.

“黑马”是一个意外的比赛,显示速度和首先是,尽管专家们说,他获胜的机会不大.
在政治方面,是办公未知谁胜一提名候选人或选举被称为“黑马”.
英国首相迪斯雷利被认为是被首先使用的短语.在他的小说中,年轻的公爵在1831年出版,迪斯雷利描述赛马,并告诉如何首选落后了,而“黑马从未虽然已经过去的看台冲到笼统的胜利.”
作为一个政治词语,“黑马”出现首次锡1844年全国民主大会党.“黑马”诺克斯波尔克是詹姆斯,谁成为美国第11届总统.作为一个国家领导人,他被认为是一个政治人.然而,他竟然赢得了民主党提名并当选总统.这是发生了什么事：
马丁范布伦纽约,前总统似乎对获得提名肯定.但他反对使美国德州大学的美国,花药国家的一部分领土.他反对,是因为有在德克萨斯州的奴隶制.范布伦不想再在联盟奴隶状态.因此,他失去了在那些谁支持奴隶制的民主党的支持.
在1844年公约,范布伦无法获得足够票数赢得提名.该公约是陷入了僵局.因此,民主党领导人决定,唯一明智的作法应该是运行一个“黑马”,一个人谁能够团结党.
因此,党的领袖,乔治班克罗夫特,一诺克斯提出了詹姆斯波尔克的名称.他赢了,党团结在他身后.他击败了对手,亨利辉格党的粘土.