—— 请按键盘 空白键 开始游戏 ——

The best time to plant a tree was 25 years ago. The second best time is today.
投资于农民教育就是投资于乳制品的未来。
Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.
"We need to think differently about how we approach cancer treatment."