个人的行为并非以社会福利最大化为目标。
Silence is argument carried out by other means.
The most important part of teaching is to teach what it is to know.
我喜欢有过去的女人，跟她们交谈总有说不出的乐趣。
Technology is just a tool. It's the creativity and imagination of the people using it that makes the difference.