... element of best approximation 最佳逼近元素 element of finite order 有限阶元素 element of surface 面元素 ...
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directed element of surface [数] 有向面元素
element of directed surface 有向曲面元
directed element of a surface 有向面元素
vector of surface element 面元矢量
variation of surface element [数] 曲面元素的变分
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