"There's nothing that says you have to be happy all the time."

当思想掌握了群众，它就成为一种物质力量。

The teacher's task is not to implant facts but to place the subject to be learned in front of the learner and, through sympathy, emotion, imagination, and patience, to awaken in the learner the restless drive for answers and insights which enlarge the personal life.

镜子不仅仅是一个表面，它是一个维度。

在科学中最令人兴奋的短语，预示着新发现的，不是“我发现了！”而是“这很有趣……”