积极心理学不仅仅是微笑;它是关于什么使生活值得过的科学研究。
In the world of physics, we often find that the simplest questions are the hardest to answer.
Science is the art of asking the right questions.
A woman knows the face of the man she loves as a sailor knows the open sea.
The deepest insights in mathematics often come from the most abstract theories.