远离欲望的人，他的心灵像白莲花一样纯洁。

Chemistry is the art of manipulating matter at the molecular level, and catalysis is its most powerful brush.

Chemistry is the art of building bridges between the microscopic and the macroscopic.

The duty of the Government is to leave commerce to its own capital and credit as well as all other branches of business.

我们知识的边界就是我们好奇心的前沿。