矢量相加还有一种方法，我称为“平行四边形法。”

There's another way you can do it and I call that "the parallelogram method."

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并采用平行四边形法，分析了经纬纱密度等织物参数对织物变形能力的影响。

The deformation capability affected by the fabric parameters such as warp and weft yarn density is also analyzed based on the parallelogram method.

youdao

在曲面上做一些网格，你会看到一个网上的每一小块儿，都是小的平行四边形，我们要弄清楚它的面积和法向量是什么。

You will get some sort of mesh grid on your surface and you will look at a little parallelogram that is an elementary piece of that mesh and figure out what is its area and normal vector.

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