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The green wind can convert the wind generated by the high-speed subway train to electric energy. And the electric energy is used to light the metro. When the metro running quickly in the tunnel, it will generate a great wind. If the wind crosses the green wind equipment fixed on the top of the metro, the energy will be collected and stored. And then it will be converted to electric energy by a converting module. The electricity is used for light the inner of metro finally. This process continues as long as the metro runs, and it helps to save energy greatly.