Much of the book is about their practical problems-thrust lines, the catenary curve and groin vaulting.

该书大部分都是关于他们实际存在一些的问题—外扩的线条，垂曲弧，穹型拱顶。

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Once all 'pairs' are found, I compute the catenary curve and create the cable geometry, either for plain cables or cables with hanging clothes.

一旦所有的配对都找到，我便通过计算垂曲线来创建线缆几何，无论是普通电缆还是晾衣绳都样的。

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Moreover, the curve can represent hyperbolas and catenary exactly.

此外，它可以精确表示双曲线和悬链线。

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