figurate number

例句：

1. 1. The shape of the pyramid is a perfect example of a figurate number.
   金字塔的形状是分形数的完美例子。
2. 2. The fractal pattern on the wall is a fascinating study in figurate numbers.
   墙上的分形图案是分形数研究的迷人课题。
3. 3. The fractal nature of the landscape makes it difficult to count all the figurate numbers.
   景观的分形性质使得很难计数所有的分形数。