制造链式反应机器的基本点当然是确保每次裂变产生一定数量的中子，其中一些中子再次有效地产生裂变。

I really don't remember much about Cleopatra. There were a lot of other things going on.

最重要的是对自己所做的事感到快乐。

"The challenge of filmmaking is to tell a universal story in a unique way."

In mathematics, the art of proposing a question must be held of higher value than solving it.

The ocean is the cradle of life and the hope for humanity's future. We must cherish her like our mother.