Leadership is not about being in charge. It's about taking care of those in your charge.

If you don't give up, you still have a chance. Giving up is the greatest failure.

The concept of legal validity is crucial for understanding the nature of law.

任何实验的价值和效用都取决于材料是否适合其使用的目的。

The magic number 150 suggests that the size of our social networks is limited by the size of our brains.

The chess-board is the world; the pieces are the phenomena of the universe; the rules of the game are what we call the laws of Nature.  

The pure work implies the disappearance of the poet as speaker.