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1·The mission has been hailed as an unprecedented success.

这次使命已被宣布为一次空前的成功。《柯林斯英汉双解大词典》

2·We are now witnessing an unprecedented increase in violent crime.

我们现在看到暴力犯罪空前增多。《牛津词典》

3·Such policies would require unprecedented cooperation between nations.

这样的一些政策会要求国与国之间前所未有的合作。《柯林斯英汉双解大词典》

4·The ceremony was disrupted by unprecedented heckling and slogan-chanting.

典礼因前所未有的起哄和口号声而中断。《柯林斯英汉双解大词典》

5·It was an unprecedented demonstration of people power by the citizens of Moscow.

这是莫斯科市民对人民力量史无前例的证明。《柯林斯英汉双解大词典》

6·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》

7·This achievement is surely unprecedented.

这成就确实是空前的。《新英汉大辞典》

8·It is faced with many unprecedented challenges.

它面临着许多前所未有的挑战。

9·The alarm is caused by unprecedented events in the Arctic.

这一警报是由北极地区史无前例的事件所引发的。

10·It posed an unprecedented threat to the wildlife around Antarctica.

它对南极洲周围的野生动物构成了前所未有的威胁。

前所未有

1·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》

2·After the fragments' entry, these analyses revealed unprecedented traces of sulfur.

在碎片进入之后，这些分析揭示了前所未有的硫磺痕迹。

3·They are the deeply important context for the current unprecedented global warming.

它们是当前前所未有的全球变暖非常重要的背景。

4·This opportunity is unprecedented in the history of malaria control.

这一机会在疟疾控制的历史中是前所未有的。

5·But worse than that are all the emergency and unprecedented measures taken over the last 13 months.

但比这更糟糕的是在过去的13个月内所采取的所有前所未有的紧急措施。

空前

1·If there is any good to come out of these crises, it is that we have an unprecedented opportunity to reshape the rules and institutions that guide the international economy.

如果说这次危机可以带来一些好处的话，那就是我们获得一个空前的良机，去重塑带领国际经济体系的规条和机构。

2·The summary claimed there would be unprecedented accountability in how funds are spent and said the bill would include no earmarks, the pet projects that lawmakers are fond of.

(提案)总结宣称对于如何使用这些资金将有“空前的义务”，还说开支将不包括那些众议院通常喜欢的花里胡哨的无用计划。

3·With trends like this, the Age of the Internet could usher in an era of unprecedented citizen enlightenment.

有了这样的发展趋势，互联网时代将有可能迎来公民空前觉醒时期的到来。

4·I'd characterise it as unprecedented in the history of Myanmar and on an order of magnitude with the effect of the tsunami on individual countries.

我这样形容这次的大灾难，它在缅甸的历史上是空前的，而且带来的影响与之前几个受海啸破坏的个别国家相当。

5·The goal is to provide responders with an unprecedented degree of customization to ensure they receive exactly the kind of alerts that they can respond to.

我们的目标是给急救员提供一种空前的定制，保证他们能够接收到的确是自己能响应的那种信息。

史无前例

1·The alarm is caused by unprecedented events in the Arctic.

这一警报是由北极地区史无前例的事件所引发的。

2·The unprecedented flooding in Pakistan disrupted the lives of 20 million people, but it also affected the country's arachnid population.

巴基斯坦史无前例的洪水夺去了两千万人的生命，也影响了这个国家蜘蛛的数量。

3·Unprecedented industrial growth in the country of Remo has created serious environmental problems because factories there lack adequate pollution-control systems.

由于工厂缺乏适当的污染控制系统，Remo 乡村地区的史无前例的工业增长造成了严重的环境问题。

4·But they are not unprecedented.

但这也不是史无前例。

5·Experts state that the occurrence of the high temperature this week is rather rare, though not unprecedented.

专家表示，本周所出现的高温现象虽然不是史无前例，但也相当罕见。

前无古人

1·Zimbabwe's experience was shocking, but not unprecedented.

津巴布韦的经历让人震惊，但并非前无古人。

2·U. S. swimming star Michael Phelps just completed an unprecedented feat by winning eight gold medals during the first nine days of the games.

美国游泳巨星迈克尔菲尔普斯在九天的比赛里摘得八金，完成了前无古人的丰功伟业。

3·His creation, unprecedented, and later has scholars.

他的创作，前无古人，后有学者。

4·He led worker of nearly 10 thousand oil to begin the pioneering work of unprecedented on desolate and uninhabited desert beach.

他率领近万名石油工人在荒无人烟的戈壁滩上开始了一次前无古人的创举。

5·Is you, reelection steals in three consecutive years, unprecedented, I am afraid no one will follow those of the bar.

是你，连续三年蝉联抢断王，前无古人，恐怕也后无来者了吧。

没有先例的

1·Such unprecedented laxity in India will make it hard to get others—for example, Brazil, which already does some uranium enriching of its own—to accept the tougher inspections.

对印度这种没有先例的宽松将很难使像已经进行了一些铀浓缩的巴西那样的国家接受更为严厉的核查。

2·But that does not diminish the seriousness of Russia's intervention in the election, which appears to be unprecedented.

但这并不会削弱俄罗斯干预选举的严重性，这样的干预似乎是没有先例的。

3·That is unprecedented and mistaken.

这是没有先例且错误的。

前所未有地

1·Whether it be in melodramas, comedies or kungfu movies, the popularity of women lead roles was unprecedented.

无论是在剧情片、喜剧片还是功夫片中，女影星主演的角色都前所未有地受欢迎。

2·Hailed as an online intellectual cathedral, it is an unprecedented coming together of some of the world's finest treasures.

它被誉为在线“知识圣堂”(intellectual cathedral)，世界上一些最优秀的财富前所未有地聚集在了一起。

亘古未有

1·Many of the most disruptive insights from massive log data will be of this nature: complex, buried, and unprecedented.

许多对海量日志数据最具损坏性的看法都具有这种特质：复杂，死气，亘古未有。

(1)unprecedented scale史无前例的规模