—— 请按键盘 空白键 开始游戏 ——

现在数学家面临的最大问题可能是黎曼假设。
The greatest problem for mathematicians now is probably the Riemann Hypothesis.
可持续性必须有利可图,否则就根本不可持续。
"Writing is a way of thinking, not just a record of thought."