—— 请按键盘 空白键 开始游戏 ——

Generally speaking, envy, resentment, and self-pity are disastrous modes of thoughts.Self-pity gets fairly close to paranoia, and paranoia is one of the very hardest things to reverse.
在数学研究中,坚持是关键;许多伟大的成果来自于一遍又一遍地从不同角度看待同一个问题。