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windmill 的热门建议

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Making a Windmill
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  1. Science Fair
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How I built a windmill
3:58
TEDWilliam Kamkwamba
How I built a windmill
When he was just 14 years old, Malawian inventor William Kamkwamba built his family an electricity-generating windmill from spare parts, working from rough plans he found in a library book.
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