四级For example, even with significantinvestments, such as the $93 million for wind energy development included in the American Recovery and Reinvestment Act, important alternative energy sources such as wind and bio-fuels comprise only about 1% of the market today
例如,即使有重大投资,如《美国复苏和再投资法案》中包含的9300万美元风能开发,重要的替代能源,如风能和生物燃料,也只占当今市场的1%左右
2011年12月阅读原文
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