विंडमिल, वायु ऊर्जा, ऊर्जा, वातावरण, प्राकृतिक ऊर्जा, ऊर्जा संक्रमण, गिरना, प्रकृति, पवन चक्की, ईंधन और बिजली उत्पादन, पवन ऊर्जा
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