那么，如果出现房价下跌和经济急剧减速，伯南克该怎么办？
How should Mr Bernanke respond to falling house prices and a sharp economic slowdown when they come?
他们认为，近年来，许多动物物种数量的急剧减少，像青蛙、鱼类和老虎等等，其锐减速度赶得上过去5亿4千万年以来五次大规模物种灭绝的任意一次。
They believe that the steep decline in populations of many animal species, from frogs and fish to tigers, is as fast as any of the last five extinctions in the past 540 million years.
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