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不错！在三维空间中，总共就只有六个方向；在n维空间中，有2n个方向。
pyramid
(金字塔)
(#231453@0)
Last Updated: 2001-10-21
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Replies, comments and Discussions:
汇报一下开MARK VIII的感受：
枫下论坛主坛
/
枫下家园
/
爱车一族