每当心情郁闷的时候，用手托腮就好，手臂会因为帮上忙而开心的。
Even in the grave， all is not lost.
渔业的未来取决于平衡——经济需求和生态限制之间的平衡。
Program testing can be used to show the presence of bugs, but never to show their absence!
The Langlands program is a vision of how mathematics could be unified.
Things don’t have to change the world to be important.
Never stop learning, because the world never stops changing.
抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。