The principles of conditioning apply equally to all species.

我对与任何人竞争都不感兴趣。我希望我们都成功。

最危险的艺术是让人思考的那种。

Every tree we plant today is a legacy for future generations.

Let’s face it, a nice creamy chocolate cake does a lot for a lot of people; it does for me.　　

对称性不仅是自然的一种属性，而且是寻找物理定律的指导原则。