👥 人口分布：人为什么挤在几个地方👥 Population Distribution: Why People Crowd Into a Few Places
上一片给时间切片（时区）。这一片数人住哪。🌍 蓝色星球向导带着人口普查表来了。同样是中国人，东边挤爆、西边空旷。人到底爱住哪？Last leaf sliced up time itself. This leaf counts where people live. 🌍 Blue Planet Guide arrives with the census in hand. Same country — yet the east bursts at the seams while the west stands empty. Where do people love to live?
第 1 步：人，全挤在东边Step 1: Everyone squeezes into the east
先看普查结果——地图上的点告诉你，人都住哪。Look at the census first — the dots on the map show where everyone lives.
地图上每个点代表一群人。东部沿海挤满绿点，西部只剩零星黄点。人口密度就是每平方公里住多少人。东部密，西部疏。Each dot stands for a crowd of people. The eastern coast packs in green dots, while the west keeps only a few yellow ones. Population density means people per square kilometre. Dense east, sparse west.
你可能会问：西边地方大得多，大家干嘛都挤过去？You might ask: the west is far bigger — why does everyone squeeze east?
第 2 步：人跟着好日子走Step 2: People follow the good life
人爱住四样全的地方。地形要平：平原好走好盖房。气候要暖湿。水要够：河海湖泊。还要有工作：城里机会多。高山缺水高寒，人自然少。People love places that have all four. Flat land: plains are easy to walk and build on. Warm, wet climate. Enough water: rivers, lakes, seas. And jobs: cities full of chances. High, dry, freezing mountains get few takers.
那有没有一条线，一眼看出东挤西空？Is there a single line that shows “crowded east, empty west” at a glance?
第 3 步：胡焕庸线Step 3: The Hu Line
1935 年，地理学家胡焕庸画了一条线。北起黑河，南到腾冲。线东边不到一半国土，住着九成以上人口。近百年过去，这条线基本没动。晚上看灯光也一样：沿海灯火连片，内陆只有零星灯火。In 1935, geographer Hu Huanyong drew one line. It runs from Heihe in the north to Tengchong in the south. East of it lies less than half the land — yet over ninety percent of people. A century on, the line has barely moved. Night lights agree: the coast glows in one sheet, the inland keeps only scattered sparks.
🎮 你来当普查员（30 秒）🎮 Your turn: be the census taker (30 seconds)
先拖宜居度滑块，看人口点往哪边聚集。再过下面 4 关，预测哪里人多、解释胡焕庸线。First drag the livability slider and watch the dots cluster. Then clear 4 levels: predict where crowds gather and explain the Hu Line.
一句话记住它：人口分布就是人住哪。哪里好住，人就往哪挤。Remember it in one line: population distribution is simply where people live. People squeeze toward good land.
分布不均：东多西少，沿海多内陆少。密度看每平方公里人数Uneven by nature: crowded east and coasts, empty west and inland. Density counts people per square kilometre人跟四样走：平坦地形，暖湿气候，河海水源，工作机会People follow four things: flat land, warm wet climate, river and sea water, job chances胡焕庸线：黑河到腾冲。东边小块地，住着九成以上人口The Hu Line: Heihe to Tengchong. A small eastern patch holds over ninety percent of people
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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