问鼎中原

Explanation: Question asked Ding ancient cooking utensil, three-legged ears. Central Plains along the Yellow River, referring to the territorial boundaries. Metaphor of an attempt to seize the world. 　　Source: Yu casting Jiuding ancient legend, on behalf of Kyushu, as the national symbol of power. Xia, Shang and Chou dynasties in the country to preach the Jiuding weighing equipment to get the world who are in possession.