从2000年开始，美国的页岩天然气产量已经激增了十二倍，达到了4.9万亿立方英尺，大约占全国天然气总产量的四分之一。
Production has soared twelvefold since 2000, to 4.9 trillion cubic feet, or a quarter of the country's total gas output.
这种片脚类体长少于十分之一英寸(6毫米)，群体生活，在每11立方英尺(1立方米)的海床中的个体数近12000。
Less than two-tenths of an inch (6 millimeters), this sea bug lives in groups of up to 12, 000 individuals per 11 square feet (1 square meter) of ocean floor.
自2000年期其产量飙升至4.9万亿立方英尺，翻了12倍，相当于全国天然气输出的四分之一。
Production has soared twelvefold since 2000, to 4.9 trillion cubic feet, or a quarter of the country's total gas output.By 2035 the proportion could rise to half.
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