Windmills for energy. Sustainable ecological electrical power generator powered by wind natural energy source. Old school of vintage label. Sheet of white paper. Monochrome typographic labels, sticker 风车为能源。以自然风能为动力的可持续生态发电机。古董店的老字号一张白纸。单色印刷标签、贴纸、标识和徽章。平面矢量图解