The past is a shadow that follows us, a ghost that haunts us.

科学家不满足于停留在表面现象。

The writer must be a defender of freedom, even at the cost of his own comfort.

The more we learn, the more we realize how little we know.

世界上最宝贵的资源不是石油，而是人类的潜力。

与他人比较是让我们对自己的生活感觉更糟的可靠方法。