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.
不过，如果列表是二维的(即每个元素本身是一个列表)，那么您通常想要在遍历时“解开”每个嵌套列表的内容。
Based on image processing technology, a method of geometric modeling is presented for two dimensional 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。
Metbods: a two dimensional 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.
方法：用二维有限元法分析阻萌力减少前后下第一磨牙牙周组织内应力分布的变化。
Two dimensional dynamical finite element and effective stress method were used to analyze dynamical response of Qifenghu Lake earth-rock dam during earthquake.
采用二维动力有限元方法并结合有效应力法对栖凤湖土石坝受地震作用的动力响应进行了分析。
Using a spatial composite finite element method, combining three-dimensional solid element and bar element, the mechanical analysis of a two-span curved PC continuous box girder bridge is conducted.
采用三维实体单元和杆单元相结合的空间组合有限元方法，对一座两跨曲线预应力混凝土箱形连续梁桥进行空间受力分析。
Based on the theory of surface diffusion, a finite element method was developed to simulate shape evolutions of two-dimensional microcracks with surface perturbation.
根据表面扩散控制下物质迁移规律，建立有限单元法，对裂面形貌扰动下二维微裂纹演变过程进行数值模拟。
In this paper, for solving the parameter problem of two dimensional wave equation, the method of Finite Element and the Pulse Spectrum Technique, i. e. the iterative process are used.
本文针对求解二维波动方程的参数问题，利用有限元方法把波动方程反问题转化为有限元反问题，并利用脉冲谱技术，即一个迭代过程进行求解。
Two-dimensional thermal simulations of the microbolometer with a micro-bridge structure by finite element method were done.
利用有限元法对微桥结构的测辐射热计进行了二维热模拟。
The research about finite element analysis for two-dimensional thermal structures with uncertain parameters has extensive engineering-background, important theory meaning and academic value.
不确定性参数的二维热结构有限元分析研究有着广泛的工程背景和重要的理论意义与学术价值。
The gap element method is used to analyse two-dimensional elastoviscoplastic contact problem of circular tubes under explosive welding for the first time.
首次采用间隙元法求解金属圆管在爆炸焊接时的二维弹粘塑性大变形的接触问题，对圆管内包爆炸焊接的全过程作了详细分析。
Two-dimensional finite element modeling was used to simulate the thermal stress in unpassivated and passivated aluminum thin film interconnects.
对有钝化层与无钝化层的铝互连线的热应力进行了数值模拟，并建立起互连线的二维有限元模型。
A two-dimensional axisymmetric finite element model of sampling tube and sediments is built.
建立了取样管与沉积物接触的二维轴对称有限元模型。
In this paper, we discussed to Algebraic Multigrid (AMG) method for higher-order finite element equations in two dimensional linear elasticity.
本文主要对求解二维弹性力学问题高次有限元方程的代数多重网格(amg)方法进行了讨论与探讨。
In the paper, we present some two-grid methods for solving two-dimensional reaction-diffusion using expanded mixed finite element method.
在本文中我们提供了几种解决两维反应扩散方程的扩张混合有限元的两层网格方法。
The arithmetic of quadtree mesh generation was studied in order to solve the problem of the finite element automatic quadrilateral mesh generation for a two dimensional complex region.
针对有限元前置处理中二维复杂域四边形网格自动剖分问题，对四叉树网格剖分算法进行了研究。
The two dimensional fluid Reynolds equations were established using the finite element method. The pressure distribution, opening force and upstream pumping rate of spiral groove were obtained.
用有限元数值计算的方法得出了一定条件下螺旋槽上游泵送机械密封端面间液体的压力分布、开启力及上游泵送量等。
The magnetic leakage factors of two types of claw-pole alternators were computed using a three-dimensional (3-d) finite element (FE) method.
用三维有限元方法计算一台电励磁爪极发电机和一台新型混合励磁爪极发电机漏磁系数。
The application of the Natural Element Method (NEM) to problems in two-dimensional elastostatics is presented.
介绍自然单元法（NEM）在处理二维弹性力学问题中的应用。
Using the notion of coefficient matrix and maximal element. We prove that the Lie algebra is semi-simple and it has no abelian two dimensional subalgebra.
利用系数矩阵和极大项，证明了这类李代数是半单李代数且没有二维交换子代数。
Hexhedral element for three dimensional parts and triangle and quadrilateral mesh for two dimensional parts can be generated.
利用该软件，可生成三维八节点六面体单元，同时也可生成二维三角形和四边形单元。
The numerical method of coupled boundary integral equation and finite element has been used to compute the forces of wave diffraction and radiation on large two dimensional objects.
本文中采用边界积分方程和有限元耦合的数值方法，计算了二维波浪绕射和辐射问题。
A two-direction shear deformation finite element model is presented in which a three-dimensional problem is reduced to a two-dimensional one and thus the calculation is much simplified.
文中提出了“双向剪切变形”有限元模型，使三维问题简化为二维问题，计算工作量大为减少。
Objeclive:To establish a two dimensional finite element analysis model for hard tissue morphology on lateral cephalometric X ray film.
目的：建立X线头颅侧位定位片硬组织形态二维有限元分析模型。
The finite element method is applied in this paper to the calculation of the gravity anomaly for the two-dimensional body, which has arbitrarily shape and homogeneous density in each element.
本文用有限单元法计算形状任意、密度分块均匀的二维物体的重力异常。
For every time step, the two dimensional Laplace's equation is solved by a finite-element method, so the potential distribution over the foil is given.
每一个时间步长，用有限元方法解二维的拉普拉斯方程，求出箔上的电势分布。
This paper reports a kind of two-dimensional combined vector hydrophone of resonant-column type in which a piezoelectric accelerometer are used as are sensing element.
介绍一种采用两只压电加速度计作为敏感元件的二维同振型组合矢量水听器。
We deal with the triangular mesh-discontinuous finite element method for solving the time-dependent anisotropic neutron transport problem in two-dimensional cylindrical geometry.
本文研究了求解二维输运问题的各向异性三角网间断有限元数值方法。
In the two-dimensional interpretation, we adopt the point source finite-element method and the reciprocity principle which can lighten the calculation burden.
二维解释是采用点源有限单元法，为减少计算量，利用了互换原理。
This paper presents a stress analysis of spur gears by two-dimensional Boundary Element methods (BEM).
本文利用二维边界元法对直齿圆柱齿轮齿根弯曲应力作了详细分析。
This paper presents a stress analysis of spur gears by two-dimensional Boundary Element methods (BEM).
本文利用二维边界元法对直齿圆柱齿轮齿根弯曲应力作了详细分析。
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