The duty of man is the same in respect to his own nature as in respect to the nature of all other things.
A world without books is a world without light.
La literatura no sirve para nada, y por eso es indispensable.
拓扑和量子力学之间的相互作用是一个丰富的研究领域，它以其深度和复杂性不断给我们带来惊喜。