That “democracy” is a somewhat vague term which I cannot define precisely. We ought to say, therefore: “I am fairly certain that it is a good thing if a government has something of the characteristics that are common to the British and American Constitutions,” or something of this sort.

计算复杂性的本质是理解什么可以被有效地计算的极限。

世界这么大，人生这么长，总会有这么一个人，让你想要温柔地对待。

一个伟大的故事是在翻完最后一页后仍久久萦绕在脑海中的故事。

【讲解】：（教学生）不到他苦思冥想怎么也弄不明白的时候，不去开导他；不到他想说而又说不出来的时候，不去启发他。告诉他（四方形）的一个角，他不能由此推出另外三个角，就不再往下教他（新知识）了。