正方形是二维的，立方体是三维的。
A square is two-dimensional and a cube is three-dimensional.
本文介绍了采用三维光弹性应力冻结法，对旋转正方形试样半边裂纹应力强度因子进行研究的成果。
This paper introduces a research result on the stress intensity factors of crackles on single side of revolving square sample with the stress freezing in three-dimensional photoelasticity.
有六个正方形或长方形侧面的三维形状。
数据立方体是二维表格的多维扩展，如同几何学中立方体是正方形的三维扩展一样。
Data cubes are multidimensional extensions of 2-d tables, just as in geometry a cube is a three-dimensional extension of a square.
碟片里以三维立体空间介绍许多形状，比如立方体(对正方形)和球体(对圆形)。
The video shows the 3-dimensional versions of many shapes, such as the cube (for the square), and the sphere (for the circle).
碟片里以三维立体空间介绍许多形状，比如立方体(对正方形)和球体(对圆形)。
The video shows the 3-dimensional versions of many shapes, such as the cube (for the square), and the sphere (for the circle).
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