竖井凿到了五百米,始终不见金子,时间也一点点到了冬天。井壁在春天秋天时向下滴水,水流到了井底,用水泵再抽上来,并不影响施工。到了冬天,细水就结出了冰,天气太冷了,零下二十摄氏度,寒气来者不拒,有多少水就能结出多少冰。到了后来,井筒空间越来越小,工人上下班乘坐的罐笼上下都困难。有一回,工人下了班,罐笼提到离地面不远处,被冰卡住,上不得下不得,卷扬机巨大的提升力,差点把井架上的天轮拉坏,工队不得不宣布放假。
The \(n\)-dimensional hyperbolic space \(\mathbb{H}^n\) is the unique (up to isometry) simply connected, complete Riemannian manifold of constant sectional curvature \(K = -1\).
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For those who want that dark cyberpunk aesthetic, there's always black.