—— 请按键盘 空白键 开始游戏 ——

模型检查的挑战不仅在于发现错误,还在于理解它们为何发生。
一本好的图画书就像一个好笑话——需要完美的时机。
Laughter and tears are both responses to frustration and exhaustion. I myself prefer to laugh, since there is less cleaning up to do afterward.