天无二日

Explanation: Date: Sun, metaphor king. No two sun in heaven. Yu Yiguo can not have two old monarch. Everything should be in a system metaphor, not the two coexist. 　　Usage: The main predicate; as object; that only one dominant power 　　Source: Han Dai Holy "Book of Rites Square mind": "Heaven is exactly the same day, the king of soil goes, goes for the main house, statue goes on." 　　Examples: ~, I Hath two masters indeed! (Qing Chen Chen, "Water Margin after the transfer," the twenty-third back)