回复：回复：回复：Erdos 称金币题：（3星）

来源: 波斯王子 于 2010-03-10 20:24:03 [] [旧帖] [给我悄悄话] 阅读数 : (58 bytes)

But how do you know the bag you took out 0 is good or bad?

请您先登陆，再发跟帖！