—— 请按键盘 空白键 开始游戏 ——

The most important property of a program is whether it accomplishes the intention of its user.
物理学和数学之间的界限并不像我们想象的那么清晰。
请勇往直前,一路勇往直前,然后用推特(Twitter )大肆宣扬你努力的成果。搞不好你会名满天下。
User needs are both the starting point and the ultimate goal of product development.