Plotted on a graph, the history of clean-energy production in the United States resembles the blade of a saw, rising and falling each time subsidies came and went.
从图上看，美国清洁能源的生产的历史就像是锯齿，随着补贴的来去而起落。
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It has profited from the domestic and foreign research results, in this foundation, it discussed automatic production of attack path, as well as attack graph algorithm comparison.