The greatest use of life is to spend it for something that will outlast it.
在观察性研究中,我们常常不得不依赖于无法直接检验的假设。
The world is full of stories, and from time to time they permit themselves to be told.
给学生一些事情去做,而不是一些东西去学;而这些事情的性质需要思考;学习会自然而然地发生。