要理解行为，我们必须从生存和适应的背景中审视其目的。
To understand behavior, we must look at its purpose in the context of survival and adaptation.
我一直想成为一名舞者。那是我的初恋。
"You can't always get what you want, but sometimes, you get what you need."
科学表明，我们的头脑会欺骗我们关于什么会让我们快乐。