降低成本的最好方法是一开始就没有成本。

The world is my country, all mankind are my brethren, and to do good is my religion.

化学之美在于它能解释看不见的事物。

Real freedom does not mean that you can do anything you want, rather you can reject what you do not want to do.

做事情，不能有伤害别人的坏念头；但要有警惕他人、防备他人的念头。这是在告诫与人交往思考不周的人。