来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/04/27 14:05:35
实例证明地球 球体
if the earth is flat,then if u watch the sails on the beach,u would see the sail completely,but then in reality,u can only see the top of sail at a far distance,then the whole thing if the sail comes close
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