Explanation: There have been recorded in the annals of this kind. Describe the history of similar incidents occur frequently. "Zuo Xianggong twenty-nine": "Public Bureaucrats have been in North Korea, history is not absolutely." Liu Danian "Taiwan seventeen hundred years of history": "the first official record of the history of Taiwan is one the Three Kingdoms Shen Ying of the "Seaboard Geographic Gazetteer." subsequent history is not absolutely, so far more than a thousand seven hundred years. "