Such a move is rare, but not unprecedented.

这样的举动少见，但并非从来没有过。

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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。

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But they are not unprecedented.

但这也不是史无前例。

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The president is a certified diver but other Cabinet members had to take lessons in recent weeks to prepare for the unprecedented meeting.

VOA: standard.2009.10.17

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。

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The United States must lead the way. But our best chance to solve these unprecedented problems comes from acting in concert with other nations,".

VOA: standard.2009.04.11

Longtime aviation consultant George Hamlin says the slowdown at American has been bad, but not unprecedented.

FORBES: As American Airlines' On-Time Rate Improves, Can We Dispense with the Media Outrage?

It is unusual but not unprecedented for a judge to preside at bedside for an injured defendant.

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Its ambitious plan calls not only for an end to new planting, but for unprecedented eradication of existing crops.

ECONOMIST: Deadly drug? That��s coca leaf