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Alligator gar are the second largest freshwater fish in North America. Later it disappeared from the state's waterways in the 1990s. 鳄雀鳝是北美第二大淡水鱼。后来，也就是20世纪90年代的时候，水域中就再没发现过这种鱼
发表于:2018-12-08 / 阅读(176) / 评论(0)
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New Technology Harvests Energy from River and Tidal Movement A number of companies have used the wind and sun to produce energy. Now, one company is using the force of flowing rivers and ocean currents. The company is based in the U.S. state of Maine
发表于:2019-01-03 / 阅读(115) / 评论(0)
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