It is faced with many unprecedented challenges.

它面临着许多前所未有的挑战。

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America's economy is facing unprecedented challenges.

美国经济正面临着前所未有的挑战。

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But the speed and scale pose unprecedented challenges.

但无论是速度还是规模都是空前的挑战。

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These new strategies present unknown and unprecedented challenges to regulators, and these new challenges call for a deferential approach.

FORBES: Correcting Herb Kohl (And Kayak And Bing Travel ...) On Google/ITA

"During recent weeks, the financial landscape has changed significantly and presented us with unprecedented challenges, " said Wachovia chief executive Robert Steel.

FORBES: The Big Banks

Chinese-language media across the political spectrum point out that China is at a turning point and critical stage of reforms amid unprecedented challenges.

BBC: China media: New era in Beijing