However, if the list is two-dimensional (that is, each element is itself a list), then you often want to "unpack" the contents of each nested list as it is iterated. You could do that like so.
Based on image processing technology, a method of geometric modeling is presented for twodimensional finite element analysis of asphalt mixture.
提出了一种基于图像处理技术的沥青混合料二维有限单元分析的几何建模方法。
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Metbods: a twodimensional finite element model was built up to analyse the stress within the periodontal tissue of the first molar, with a reduced tooth eruption-resistant force.