Positive psychology is not just about feeling good, it's about the good life.
The most important skill for a computer scientist is problem-solving.
用程序证明四色定理不会改变数学——它只是证明了这个挑战了一个世纪的定理是一个有限的问题。
To lose one parent may be regarded as a misfortune; to lose both looks like carelessness.