—— 请按键盘 空白键 开始游戏 ——

Nothing’s lost forever. In this world, there’s a kind of painful progress. Longing for what we’ve left behind, and dreaming ahead.
没有什么会永远失去。在这个世界上,有一种痛苦的进步。既怀念我们留下的,又梦想着未来。
The PAC learning framework provides a formal way to quantify the learnability of a concept class.
With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how.
For beautiful hair, let a child run his or her fingers through it once a day.
The future of the world lies in the cities of the Third World.