铁板不易

Explanation: Easy: easy to change, change. Did not change as iron. Describe the same can not be changed. 　　Source: Qing Li Luyuan "Qiludeng" Ninety-fifth back: "The so-called 'Zang Valley sheep', its death will be more than this is not easy to iron it." 　　Examples: So when he said to the ancients: miser Zan wealth, is bound to lag behind the others son. These two words, is the ancient times - truth. ★ Qing Liu Zhang, "cut a ghost pass" The fifth round