Not all of us can afford to be romantic.

You have to keep thinking about what you can do to make the world a better place.

The roots of education are bitter, but the fruit is sweet.

世界是一个残酷的地方，艺术是它的复仇。

The beauty of mathematics lies in its ability to describe the universe with such precision.

What man actually needs is not a tensionless state but rather the striving and struggling for some goal worthy of him.

科学的进步不仅通过知识的积累来衡量，还通过提出新问题的能力来衡量。