I have great faith in fools; self-confidence my friends call it.

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.

The past is a mirror that reflects the present.

计算的本质在于信息的转换。

最强大的人是能够承认自己弱点的人。

现代林业必须平衡三个轴心：生态、经济和道德。