换代huàndài 1.改变朝代{change of dynasty or regime}: 改朝～。{change from one dynasty to another} 2.指产品在结构、性能等方面比原来的有明显的改进和发展{(of a product's structure and property) upgrade; regenerate}: ～产品{upgraded product}|加快产品的更新～。{accelerate the development of new models and new products}