鸟枪换炮

Explanation: Describe the circumstances or conditions greatly improved. 　　Usage: The main predicate; as predicate, object, attribute; describe the circumstances or conditions greatly improved 　　Source: Qing Wen Kang "Heroic Biography" 36 back: "That is like a pipe for blowing gas tube, blow tube for shotgun, Niaoqianghuanpao, the more the more strong the wind."