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单词 cephalopod mollusk
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In early fish-like vertebrates more than 500 million years ago; in a common ancestor of arthropods, such as insects, spiders, and crustaceans, at around the same time; and then in the cephalopod mollusks around 300 million years ago.

在 5 亿多年前的早期类鱼脊椎动物中;节肢动物的共同祖先,如昆虫、蜘蛛和甲壳类动物,大约在同一时期;然后是 3 亿年前的头足类软体动物。

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