地理决定论 · GEOGRAPHY OF POWER
Where the Land Decides — China · The Hu Line
一条从黑河斜划到腾冲的线，把中国分作两半——线之东南约 44% 的国土，住着约 94% 的人，自 1935 年起几乎没变。
自西向东，中国地势像三级台阶下行：青藏高原、中部高原与盆地、东部平原。海拔每降一级，人口便密一分——胡焕庸 1935 年画下的这条线，九十年后几乎纹丝未动。
A line drawn from Heihe to Tengchong splits China in two — the ~44% of the land southeast of it holds about 94% of the people, almost unchanged since 1935.
West to east, China steps down in three giant terraces — the Tibetan Plateau, the central highlands and basins, then the eastern plains. Each step down, the people grow denser; the line Hu Huanyong drew in 1935 has barely moved in ninety years.