States are rational actors, and they will always act in their own self-interest.

The chemical industry has a responsibility to lead the way in reducing environmental impact.

巴菲特批评自己在航空业投资的错误时说

The strength of a response tendency depends on the amount of reinforcement received.

In silence, we find the truth.

我们必须面对现实，即使现实是残酷的。