为了确定拱顶的链状曲线，他会用大头针将基座草稿钉到天花板上，吊上几圈绳子，在绳子上加重，与向下的力相符。
To determine the catenary curves of arches, he would tack a sketch of a foundation plan on the ceiling, hang loops of string, and attach weights along the loops in proportion to down forces.
这种针迹的主要特点是链状，这说明了这种针迹是自身打圈形成的。
The main characteristic of this stitch is the chain formation which indicates that it is formed by looping into itself.
最初链钩针针是所有其他钩针针基础。
The initial chain crochet stitch is the basis for all other crochet stitches.
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