2010年，随着住房价格的激增，波兰的经济增长率比前年增长了一倍多，达到了3.8%。
In 2010, as home prices surged, Poland's economic growth rate more than doubled over the previous year to 3.8%.
中国在过去20年利用污染收费制和其他措施，在经济产出增长一倍的情况下使空气和水污染问题没有进一步恶化。
Moreover, during the past two decades, China has used pollution charges and other measures to keep both air and water pollution levels constant even as economic output has doubled.
但如果中国继续过去那种高碳经济增长模式，排放量增长速度就可能会增加一倍。
But emissions would rise twice as fast if China pursued the high-carbon economic growth of the past.
但与这些观点相反的是，我们看到了过去十年最快的经济增长，我们的赤字减少了三分之二，股市市值翻了一倍，医疗通货膨胀率是过去50年来最低的。
Instead, we've seen the fastest economic growth in over a decade, our deficits cut by two-thirds, a stock market that has doubled, and health care inflation at its lowest rate in 50 years.
而据维萨公司的研究显示，在经济富裕的旅行者当中，单人旅行的次数更是增长了一倍有余。
And among affluent travelers, solo travel has more than doubled, research from Visa shows.
而据维萨公司的研究显示，在经济富裕的旅行者当中，单人旅行的次数更是增长了一倍有余。
And among affluent travelers, solo travel has more than doubled, research from Visa shows.
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