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单词 radially symmetrical
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TED-Ed(视频版)

Sea cucumbers are members of the phylum Echinodermata, along with sea urchins, starfish and other radially symmetrical, " spiny-skinned" marine invertebrates.

海参是棘皮动物门的成员,还有海胆、海星和其他径向对称的“多刺”海洋无脊椎动物。

PBS地球-动物趣闻

The first radially symmetrical echinoderm known from the fossil record is Camptostroma, which showed up between 516 and 513 million years ago in Pennsylvania.

化石记录中已知的第一个径向对称棘皮动物是 Camptostroma,它出现在 516 到 5.13 亿年前的宾夕法尼亚州。

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