This “patent cliff” has been estimated to be worth a staggering $200 billion over the period 2008-12.

估计从2008到2012年，这种“专利失效 ”造成的损失惊人，大约为2000亿美元。

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There is still a staggering gap—almost a third of the state’s students are black—but the improvement in Alabama was the largest in the country over that period.

虽然这与该州三分之一的学生为黑人还是有差距的，但在过去的这段时间中，阿拉巴马州已经是全国进步最快的了。

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There is still a staggering gap—almost a third of the state’s students are black—but the improvement in Alabama was the largest in the country over that period.

虽然这与该州三分之一的学生为黑人还是有差距的，但在过去的这段时间中，阿拉巴马州已经是全国进步最快的了。

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