Home prices began climbing at an unprecedented rate in 2001.

房屋价格在2001年以前所未有的速度上升。

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As a result, new diseases are emerging at an unprecedented rate.

因此，新疾病正在以空前速度出现。

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New diseases are now emerging at the unprecedented rate, on average, of one per year.

新疾病现正以平均每年一种的空前速度出现。

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Last year, China venture recovered from a slump and gained at an unprecedented rate.

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But still: The United States energy market is changing at an unprecedented rate.

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These were often assets that were mortgage backed and were losing a substantial amount of value at an unprecedented rate.

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