如果你无法向非科学家解释你的化学研究，说明你理解得还不够深入。

The great powers are always searching for opportunities to gain power at the expense of their rivals, and they will use force if they think it will profit them.

We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

"I never doubted myself."

现代文化的发展特点是一个人可能称之为客观精神对主观精神的支配。