"We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm."

文学是对生活的虚假再现，但它帮助我们更好地理解生活，指引我们在出生、经过和死亡的迷宫中找到方向。

Do not linger to gather flowers to keep them,but walk on,for flowers will keep themselves blooming all your way.

对于系统，翻版的模拟是在控制图中添加一个创建循环的边，而不仅仅是一个附加节点。

The only learning which significantly influences behavior is self-discovered, self-appropriated learning.

当最后一棵树被砍倒，最后一美元将失去意义。