—— 请按键盘 空白键 开始游戏 ——

The only way to learn mathematics is to do mathematics.
"Every book is a door to another world, a world that exists only in the imagination of the reader."
创新不仅仅是技术的问题;它关乎改变思维方式和打破障碍。
I tend to think that the camera is much more truthful than the human eye.