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胡焕庸线——从黑龙江瑷珲至云南腾冲的一条直线(故亦称瑷珲—腾冲线),是中国人口地理的一条重要界线。1935年,我国人文地理学奠基人,时任中央大学地理系主任的胡焕庸先生在研究中国人口分布问题时“试拟”了这条界线:"今试自黑龙江之瑷珲,向西南作一直线,至云南之腾冲为止,分全国为东南与西北两部,则此东南部之面积,计四百万方公里,约占全国总面积之百分之三十六;西北部之面积,计七百万方公里
Hu Huangyong Line - A straight line from Heilongjiang Helena to Tengchong in Yunnan (hence the name 瑷 珲 - Tengchong) is an important boundary of China’s population geography. In 1935, when Hu Huanyong, the founder of the Department of Geography in the Central University of China, was the founder of the Department of Geography in China’s Central University, he tried to test the distribution of population in China. As a straight line, until Tengchong in Yunnan Province, divided into two parts of the country as the southeast and the northwest, the southeastern part of this area is estimated at 4 million square kilometers, accounting for 36% of the total area of the country. The area of the northwest , Counting seven million square kilometers