交联聚乙烯电缆；电树枝化；升压速度；树枝形态；分形维。
XLPE cable; electrical treeing; boosting rate; tree morphology; fractal dimension.
这些物种在形态上也有所不同：呆在草上的动物体型纤细，尾巴很长；呆在树上的动物体格健壮，腿长；而呆在树枝的动物体型纤细，但腿短。
These species also differ morphologically: grass dwellers are slender with long tails, tree-dwellers are stocky with long legs, twig dwellers are slender but stubby-legged.
我在树枝间漂浮，研究它的分叉形态，发现它像个普通的树，而不是电脑做图的那种假树。
I floated up through the branches and studied their fractal patterns, which seemed just like a normal tree, not a fake computer-generated one.
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