E.g. , you came at 4 o'clock afternoon. So rise from 3 o'clock, I begin to feel happy. Time draws near more, I feel happy more. Arrived at 4 o'clock when, I meet feel restless: I can discover happy cost.
比如说，你下午四点钟来。那么从三点钟起，我就开始感到幸福。时间越临近，我就越感到幸福。到了四点钟的时候，我就会坐立不安：我就会发现幸福的代价。
There is only one good, which is knowledge, and one evil, which is ignorance.
The pace of change demands that we unlearn as much as we learn.
科学的进步不仅是通过回答问题，而是通过提出更好的问题。