Topology is the study of the properties of a figure that are unchanged by any deformation.
拓扑学是对图形在任何变形下保持不变的性质的研究。
说话过多会有不当之处，不如沉默寡言以保无虞。
The Greeks understood the mysterious power of the hidden side of things. They bequeathed to us one of the most beautiful words in our language—the word 'enthusiasm'—en theos—a god within.
The dead are our teachers, if we know how to listen.
"The stories we tell about ourselves and others have the power to shape our understanding of the world."
"The world is a book, and those who do not travel read only one page."