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该题目的中文意思这道题目本身不难，考查你的英文水平...... 应该是说正在丢失的陆地是个半“圆环”，第一年的时候内环半径为0，随着地被侵蚀，内环半径不断增加。 研究了半天阿，就为了搞懂这个题说的意思呀！感谢wcw，谢谢你的帮助！！ Followed by:
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