二维空间的封闭是圆,三维空间的封闭是球,四维空间的封闭是什么? 知乎 Template




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Try and sketch some of theseBunk beds, Microscope, Triplets, Christmas tree, Giant, Oak, Parents, Horse, Whip, Tiger, view more ideas


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tomski二维空间的封闭是圆,三维空间的封闭是球,四维空间的封闭是什么? 知乎 coloring