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One of the key sources of renewable energy being developed today is wind power, utilizing giant turbines to generate electricity. These work best in windy places like the U.S. Great Plains that stretch from west Texas in the south to the Dakotas in
发表于:2019-01-13 / 阅读(56) / 评论(0)
VOA标准英语2009年(三月)
VOA标准英语2009年(三月)