尝胆卧薪

Explanation: Salary: firewood. Sleep sleep in the straw, and eat and sleep all taste gall. Describe one who endures and self-motivation, worked hard. 　　Source: "Shi Ji Yue Gou family," Yue hook road against the country, is suffering body Jiaosi, bile in the ride home, sitting and lying that Yang gallbladder, bile is also eating Yichang. " 　　Examples: I am humbled that the official Philippine food, ~, together wit the spirit of combat readiness, six states of the material together, most drastic, yet fear not save at all. (Ming Shi Kefa "Please apprenticeship Route Expeditionary book")