这些尖刺是由树獭兽的防御性刺状毛发特别演化而来。
These spines have been specifically evolved from the defensive urticating hairs of the slothien.
这些尖刺是由树獭兽的防御性刺状毛发特别演化而来，适应新的目的。
These spines have been specifically evolved from the defensive urticating hairs of the slothien and adapted to a new purpose.
在群岛有一种多刺的梨状样的仙人掌，它有锐利的突出的尖刺在它的外面起到保护自己的作用。
Sharp spines erupt from the skin of a prickly pear cactus in the Galapagos Islands.
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