—— 请按键盘 空白键 开始游戏 ——

That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
Small habits, big changes.
The joy of discovery in mathematics is like solving a puzzle that the universe has left for us.
创新不仅仅是创造新事物,而是让现有的事物变得更好。
乐观主义者倾向于将他们的麻烦解释为暂时的、可控的和特定于一种情况的。另一方面,悲观主义者认为他们的麻烦会永远存在,破坏他们所做的一切,并且无法控制。
The future of automobiles is green, intelligent, and human-centric.