—— 请按键盘 空白键 开始游戏 ——

Quality is never an accident; it is always the result of intelligent effort.
数学不是一门演绎科学——那是陈词滥调。当你试图证明一个定理时,你不仅仅是列出假设然后开始推理。你所做的是反复试验、实验和猜测。
Collaboration across sectors is essential to achieving meaningful progress in emissions reduction.
Light is the soul of architecture.
The world is always ending for someone.