效率是把事情做对，而效能是做对的事情。

"The world is full of stories, but it takes a special kind of person to hear them."

I don’t think of myself as a classical artist or a pop artist. I just think of myself as an artist who sings.

引力的存在是最明显的实验事实，但从理论角度来看，它是最神秘的力量。