在原子和电子的世界中，经典物理学的定律不再有效，我们必须转向量子力学以获得正确的描述。

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.

暴风雨过后，天空更晴朗。