The president took the unprecedented step of summoning all the state governors to a conference on education.

总统采取了前所未有的举措，召集所有的州长参加一次教育讨论会。

《柯林斯英汉双解大词典》

Stirrups unify lance, rkier, and horse into a force capable of unprecedented violence.

马镫将骑枪、长矛和马团结在一起，形成一股具有空前暴力能力的力量。

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To accommodate this unprecedented situation, the House of Windsor created a special title for him: the Duke of Windsor.

为了解决这一前所未有的情况，温莎王朝给了他一个特别的爵位：温莎公爵。

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It says unprecedented and globally coordinated fiscal and monetary stimulus is playing a major role in helping to restore private demand and lending.

VOA: standard.2010.06.27

But Athens was also something completely unprecedented in the world it was a democracy.

但雅典也是,世界上史无前例的城邦。

耶鲁公开课 - 政治哲学导论课程节选

And I think this is expressed in Hobbes' novel and in many ways altogether unprecedented teaching about liberty in chapter 21, a very famous and important chapter.

霍布斯的这一思想曾出现在他的小说中,以及本书第21章记载的,他在教学时对自由的见解中，本书第21章可是很有名且很重要的一章。

耶鲁公开课 - 政治哲学导论课程节选

Within ten years, the academy said, one in five young men would be unable to find a bride because of the dearth of young women a figure unprecedented in a country at peace.

ECONOMIST: Gendercide

So again, I want to thank my colleagues for making this unprecedented gathering a day of unprecedented progress in confronting one of the greatest threats to our global security.

WHITEHOUSE: Nuclear Security Summit: Presidential Press Conference

It was broadcast live on a Turkish television channel - itself unprecedented in a country where any display of PKK symbols had previously been banned.

BBC: Turkey Kurds: PKK chief Ocalan calls for ceasefire