confocal parabolas

例句：

1. 1.The confocal parabolas in the image are used to create a 3D effect.
   图像中的共焦抛物面用于创造三维效果。
2. 2. In this experiment, we'll use the confocal parabolas to analyze the shape of the object.
   在这个实验中，我们将使用共焦抛物面来分析物体的形状。
3. 3.The confocal parabolas were designed to focus light onto a specific area.
   共焦抛物面被设计用来将光线聚焦到特定区域。