存在就是与他人、与时间、与未知对话。

"When I approach a child, he inspires in me two sentiments: tenderness for what he is, and respect for what he may become."

We are all bound by the laws of our own natures.

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。