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山姆用脚印格子测量面积的方法,证明了希尔先生家的草坪比格林太太家的草坪大,他为什么要这样做呢......
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山姆用脚印格子测量面积的方法,证明了希尔先生家的草坪比格林太太家的草坪大,他为什么要这样做呢......
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