The laws of physics are universal, but our understanding of them is constantly evolving.
物理定律是普遍的,但我们对它们的理解在不断演变。
最深刻的真理往往是我们回避的那些。
It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.