Those of us who have been fortunate have a duty to give back.Whether one gives a lot as one goes along as I do, or a little and then a lot (when one dies) as Warren does, is a matter of personal preference.
在非常小的领域里,现实的粒子和波动方面同样重要,空间和时间的经典概念失去了意义。
地质时间不仅漫长,而且复杂,过程以截然不同的速率运行。
A good book should leave you slightly exhausted at the end. You live several lives while reading it.