每个人自己的满足是他关注的一切的中心。

The important thing is not to stop questioning. Curiosity has its own reason for existing.

"Books are the keys to understanding ourselves and others."

选自汉·桓宽《盐铁论·散不足》。这句话以积土成山、列树成林为喻，说明积少成多、打好基础的重要性。

In the attosecond world, time is not a river but a series of snapshots waiting to be captured.