If you were to slice a real igloo in half, you'd see a shape called a catenary.

如果把真正冰屋分成部分，你可以看见悬链线形状。

This gradually sloping shape is the same one that would form if you held a chain from both ends and let it droop.

如果你拿着一根链端，让它自由地下落，得形状就是悬链线。

All cables sag under their own weight, following a curve called a catenary.

所有电缆都在自身重量作用下下垂，遵循一称为悬链线曲线。

If you know the weight of the cable, you can use the catenary equation with the measured sag distance to estimate cable force fairly accurately.

如果您知道电缆重量，则可以使用悬链线方和测量垂距来相当准确地估计电缆力。

If you watched my video about the science of igloos, you remember that this shape, called a catenary arch, distributes tension and compression more evenly than a half circle shape.

如果你看我关于冰屋原理视频，那么你会记得这种称为悬链线拱形状比半圆形更均匀地分布张力和压力。