回复:回复:for two guys above: be rational instead of emotional

来源: 2010-05-14 08:03:49 [博客] [旧帖] [给我悄悄话] 本文已被阅读:

If the duck swims straight forward with an angle, the fox can run the shorter circle. If this angle is big enough, the duck would be caught.
If the duck can change the direction at any moment, it's too complicated.