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该题目的中文意思（在前辈的基础上完善了一下）我也是看了前辈的才懂的 稍微再给刚来的同学说明一下 就是说 给你个位置坐标 作为你家的位置 从圆心开始 陆地开始腐蚀 以一个半圆的形状开始腐蚀 每年都腐蚀50 square miles 求第几年腐蚀到你家的位置 Followed by:
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