劳动的自然价格是使劳动者能够生存并延续其后代所必需的价格，既不增加也不减少。

The past is not dead, it is not even past.

Sustainability isn't a cost center; it's the biggest business opportunity of our lifetime.

学习一种新编程语言的唯一方法是用它编写程序。

一本好书是通往另一个世界的门。