解释：不通过学习而能自己知道的，不去请教他人而能自己通晓的，从古到今没有这样的事。

The key to success is to focus on goals, not obstacles.

Emotion is the chemical reaction of mental elements.

谁能预见未来？让我们为所有研究方向提供自由空间；摒弃一切教条，无论是原子论还是反原子论！

Over the centuries the Indians developed sign language for communicating phenomena of interest. Programmers from different tribes (FORTRAN, LISP, ALGOL, SNOBOL, etc.) could use one that doesn't require them to carry a blackboard on their ponies.