没有任何一位总统能够忠实地、认真地履行他的职责,还能有闲暇时间。
No president who performs his duties faithfully and conscientiously can have any leisure.
文学是人类的记忆,是我们集体灵魂的记录。
"The only real progress lies in learning to be wrong all alone."
计算复杂性的美在于它能够根据问题的固有难度对问题进行分类。