截面（英语：Cross section）为一几何学名词，是指一三维空间下的物体和一平面相交所产生交集。截面的面积称为截面积。
截面积 [jié miàn jī]
网络释义专业释义
双语例句原声例句
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棒子的横截面积，成反比。
Inversely proportional to the cross-sectional area of the rod.
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杆件的横截面积不能为零。
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导体的电阻与其长度成正比，与其横截面积成反比。
The resistance of a conductor varies directly with its length, conversely with its cross-sectional area.
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B is the assumed cross-section of the nucleus.
假定B是核的横截面积。
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So, the number of nuclei, 119 if we were to sit and count these as well, is 119. So, we'll multiply that by just pi, r squared, to get that cross-section, and divide all of that by 1 . 39 meters squared.
如果你们数的话，原子核的数是，我们用它乘以πr的平方，得到横截面积，除以1。39平方米。
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