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告急：这句话怎么理解？

Posted by 274827185 at 2005-10-15 15:02:43 on Problem 2662 
He considers taking a path from A to B to be progress if there exists a route from B to his home that is shorter than any possible route from A。

这句话实在另人费解啊，盼高手支招！不甚感激！！
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