以抛物面壳为例，介绍了用节点坐标为未知量分析复杂剪式铰结构几何问题的方法和几何设计的步骤。

Geometry analysis and design procedure of complex pantograph structures are studied with joint coordinates as variables and parabolic shell is taken as an example.

youdao

这非常重要，由于阿雷西博望远镜的独特几何结构：尽管绝大多数的射电望远碟面都是抛物面型的，而阿雷西博的碟面是在地上挖出的一个巨大半球。

This is significant because of the unique geometrical features of the Arecibo telescope: whereas most radio dishes are parabolic in shape, the Arecibo dish is a giant half-sphere dug into the ground.

youdao

本文将分别对双曲线、抛物线的参数方程阐述几何意义(见例2、例3)。

This paper describes the geometric meaning for the parametric equation of hyperbola and parabola, respectively (see examples 2 and 3).

youdao