This is an unprecedented disaster, but also an unprecedented national rescue operation.

这是一场空前的灾难，也是一场空前的全国救援大行动。

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The 2005 hurricanes caused an unprecedented disaster for the city and surrounding communities.

2005年的飓风给这座城市及周边地区造成了前所未有的灾难。

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The release of atomic energy has changed everything, in addition to our mode of thinking, so we are drifting towards an unprecedented disaster.

被释放的原子能已经改变了一切，除了我们的思维模式，因此我们正在滑向空前的灾难。

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I'll close by saying this: This oil spill is an unprecedented disaster.

WHITEHOUSE: Deepwater BP Oil Spill: Presidential Press Conference

There were a lot of people that said, 'Oh, you're taking too long, '" the mayor said, but he called the results "a remarkable achievement, one that we expect will become a textbook case of innovation, resourceful and effective response to an unprecedented natural disaster.

WSJ: NYC post-Sandy home repair program passes 20K mark

Mr Abe said the process of dismantling the plant, which was decommissioned after the disaster, was an "unprecedented challenge".

BBC: Japan PM Abe praises Fukushima nuclear work during visit