กังหันลม
Acknowledgements
Image source
https://pixabay.com/th/photos/%e0%b8%81%e0%b8%b1%e0%b8%87%e0%b8%ab%e0%b8%b1%e0%b8%99%e0%b8%a5%e0%b8%a1-%e0%b8%82%e0%b9%89%e0%b8%ad%e0%b8%a1%e0%b8%b9%e0%b8%a5-%e0%b8%98%e0%b8%b1%e0%b8%8d%e0%b8%9e%e0%b8%b7%e0%b8%8a-%e0%b8%9e%e0%b8%a5%e0%b8%b1%e0%b8%87%e0%b8%87%e0%b8%b2%e0%b8%99%e0%b8%a5%e0%b8%a1-4550711/