统治阶级掌握着物质生产的手段；无产阶级仅有的是他们的劳动力。

The psychologist must avoid all forms of reductionism.

事物忌讳到达顶点，事情避免极其完美，人则忌讳飞黄腾达。

We must be realistic about the pace of change. The world will need oil and gas for decades to come, even as we invest in lower-carbon solutions.

Efficiency is the first virtue of engineers.