They start generating power at wind speeds of around 4 meters per second, and require wind speeds of over 7 meters per second in order to be efficient.是什么意思_They start generating power at wind speeds of around 4 meters per second, and require wind speeds of over 7 meters per second in order to be efficient.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句