英语语法分析

This is called a planimeter. And what it does is it measures areas.

它叫测面器，它能够测量面积。

The surface ratio of conus to disc was calculated using a planimeter.

我们使用面积计测量圆锥与视神经盘表面比值。

This paper presents an universal formula of assign m in the digital planimeter.

提出一个数字求积仪安置值m的通用公式。