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古往今来,有一个难题难倒了好多人,不过总有聪明的人能把这个难题给解决了。到底是什么难题呢?哈哈,那就是分田地!
Throughout the ages, one problem has stumped a lot of people, but there are always smart people who can solve this problem. In the end what is the problem? Haha, that is sub-field!