拓扑学是对图形在任何变形下保持不变的性质的研究。
Topology is the study of the properties of a figure that are unchanged by any deformation.
The universe is not only stranger than we imagine, it is stranger than we can imagine.
It is better to be a human being dissatisfied than a pig satisfied； better to be Socrates dissatisfied than a fool satisfied.
The best weapon against an enemy is another enemy.
我们都因被爱而变得更好。