行为由当前刺激情境和过去的强化历史决定。

Let him who would move the world first move himself.

I focus on one thing and one thing only – that’s trying to win as many championships as I can.

We either do the best or we don't do it at all.

奋斗是真实的，但回报也是。

自由就像我们呼吸的空气；没有它，我们会窒息。