how about 'what is the min speed of the duck'?

回答: 提示guest0072010-05-10 16:20:09

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It seems not related to the speed , but the distance. -皆兄弟也- 给 皆兄弟也 发送悄悄话 皆兄弟也 的博客首页 (47 bytes) () 05/11/2010 postreply 10:36:36

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