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並前往https://www.discovermagazine.com/planet-earth/this-is-why-some-cactus-spines-are-so-hard-and-painful-to-remove

This Is Why Some Cactus Spines Are So Hard — and Painful

In particular, cholla and other barbed cactus spines have a structure similar to porcupine quills, with shingled, overlapping barbs. These barbs ...

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