—— 请按键盘 空白键 开始游戏 ——

Sustainability is no longer an option—it's a business imperative for long-term survival.
The body is the instrument of our hold on the world.
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.
物理学的美丽在于它能够用最深刻的理论解释最简单的现象。