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这句话是什么意思？

Posted by Savior at 2006-12-21 16:16:20 on Problem 3156
In Reply To:时间咋给的这么紧呢，让好不容易ac过了的题又回来打击我一遍 Posted by:Larva at 2006-12-12 20:05:47 
"The road is build in such a manner that the only points where a traveler can leave it are the towns connected by this road."
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