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

來源: 2010-05-14 08:03:49 [博客] [舊帖] [給我悄悄話] 本文已被閱讀:

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.