To understand recursion, one must first understand recursion.
要理解递归，首先必须理解递归。
Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.
Humans, in their wish to escape loneliness, made maneuvers that were very complex and hard to fathom。
我不创造乌托邦，我描绘现实。
The best time to start building the life you want is now.
煤炭使美国在世界范围内保持竞争力。
I'm not a person who backs down.
旅行就是发现每个人对其他国家的看法都是错误的。
Art allows us to stare death in the face and not turn away.