homothetic conics

例句：

1. 1. The shape of the cone is determined by its axis and the angle between it and the horizontal plane.
   圆锥的形状由其轴和它与水平面的夹角决定。
2. 2. The symmetry of this cone allows for easy assembly and disassembly.
   这种圆锥的对称性使得组装和拆卸变得容易。
3. 3. The cone's base is wider at the top than at the bottom, creating a unique shape that is both functional and aesthetically pleasing.
   圆锥的底部在顶部比底部宽，形成了既实用又美观的独特形状。