积重不反

Explanation: After a long form style of thinking or habits, it is difficult to change. With "diehard." 　　Source: Qing Shi Dai "<Three Mountain storage industry> order": "When out at the beginning, people in the world to recruit subjects, all subjects were Yi Er strike, independent to the phase when the text is still, and Scholars as a positive way then the other hand the potential weight of not . " Thesaurus:  one's nature can hardly be altered, A leopard cannot change its spots., Jizhongnanfan, Country a good change, natures difficult, Changing one's nature is harder than, Character Hard to shift, The mountains and rivers of a country--the land Good change, womanishly fussy, Dragline Silk vine, without a scratch, little concession, gloaming heavy, Country a good change, natures difficult to move, Inveteracy Difficult than, Product weight hard anti- Antonym Group:  A careful, Zhongkou blame one another, take great trouble as overturning the river and upsetting the sea, Tuzouhula, Tuqifuju, quick flow of writer's thoughts and imagination, simplify sth. by cutting out the superfluous; simplify the complicated material; reduce to bare essentials, tear into, I out haughtiness, Back to the mountains back the sea, grudge ink as if it were gold (said of one who would not write too readily), Stir the sea turned River, Cang-dye yellow dye, death will not expiate all his crimes, Love good old prime, Mangfengguaiyun, Mangfengguaiyu, Blind wind cloudburst, Small lean, swear one's way through, Unspeakable, Who keeps company with the wolf will learn to howl., blot out the sky and hide the earth, Blotting out the sun, blot out the sky and cover up the earth, A popular trend when, as powerful as a thunderbolt