—— 请按键盘 空白键 开始游戏 ——

数学中最重要的是理解概念,而不仅仅是记忆公式。
The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.
当我们想到过去时,我们挑选的是美好的事物。我们想相信一切都是那样的。
Eyes deceive and legs fail, but it's the stomach that gets you in trouble!