- figurate numbers
- 有形: tangible; visible
- 数: frequently; repeatedly
- 形数: factor of shape; form factor; form figure; form number
- 有形: tangible; visible◇有形财产 tangible property; 有形动产 tangible personal property; 有形货物 tangible goods; 有形贸易 visible trade; 有形商品 tangible goods; 有形资产 tangible assets; tangibles
- 矩形数: rectangular number
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