鼎足而立

Explanation: Ding: Ancient cooking utensils used, round ears three feet. Compared three things side by side, often refers to three aspects of the political situation or force a stalemate 　　Usage: Partial official; as the predicate attribute; for written language 　　Source: Qian Han, "Records of the Historian Huaiyin Hou Biography": "Morrow benefit both sides and both kept, one-third of the world, Dingzu door." 　　Riddle: Three Kingdoms Period Thesaurus:  Three legs of a tripod-three rival powers The three, a situation of tripartite confrontation, Tripod, stand up to sb.as an equal, Three rival powers