北京近现代发生的很多重大历史事件都与9息息相关,诸如1919年的五四运动、1949年的北平和平解放和新中国成立等。2009年逢着上述重大事件的纪念大年,这也决定了北京历史研究的走向:纪念文章和著作纷纷出版、高端纪念大会频繁举行、相关电视文献片连续播 Many major historical events that have taken place in Beijing in modern times are closely linked with 9, such as the May Fourth Movement of 1919, the peaceful liberation of Peking in 1949, and the founding of New China. The great reign of 2009, which coincided with the above-mentioned major events, also determines the trend of historical research in Beijing: the commemorative articles and the writings have been published in succession; the high-level commemorative meeting has been held frequently and the related television documentary films broadcast continuously