交易市场就像上帝一样，帮助那些自助者。但是和上帝不同的是，交易市场不会原谅那些不知道自己在做什么的人。

Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

守住嘴巴，就跟拴紧瓶口一样。克制欲望，就像防守城池一般。

对自然的研究是永恒的乐趣。