Duffing التعريفات والمعاني == English == === Proper noun === Duffing A surname. ==== Derived terms ==== Duffing equation, Duffing's equation Duffing oscillator شارك هذه المقالة: Facebook Twitter WhatsApp LinkedIn كلمات ذات صلة Duffing equation Duffing equations duffing up during dumping ducking dubbing duling