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years/kite/sea/look at/has/important/funny

People have used wind power for thousands of ___1___. This clean and renewable energy (可再生能源) plays a(n) ___2___ role in making electricity. People often build wind turbines (涡轮机) on the mountains. The big wind turbine looks simple, but in fact it ___3___ nearly 8,000 parts in it. Please ___4___ the picture on the left. There are even wind turbines in the ___5___. People use them for different purposes.