（x,y,z）为位置函数的数据集合体。
但是您可以采用将一个四维数据结构看作是多个三维立方体的方式来理解四维数据结构。
But you can conceptualize a four-dimensional data structure by thinking of the fourth dimension as multiple three-dimensional cubes.
移动立方体(MC)算法是基于规则体数据抽取等值面的经典算法，本文最后设计开发了一个基于MC算法的医学图像三维重建系统。
Marching cubes (MC) algorithm is a classical algorithm to extract iso-surface from regular volume data. At last, a medical images reconstruction system based on MC algorithm is developed.
利用约束稀疏脉冲反演方法对崖城13—1构造的高分辨率三维地震资料进行了反演，得到了全频带的绝对波阻抗数据体。
After 3d high resolution seismic data of Yacheng 13-1 structure were inversed using restriction sparse pulse inversion, data volume of full-frequency band absolute wave impedance was gained.
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