有奖纠错
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PBS地球-动物

And it kinda looked like a flipped-over stalkless sea lily.

看起来有点像翻过来的无柄海合。

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PBS地球-动物

Crinoids became the most abundant echinoderms of the Ordovician, and some were the ancestors of today's stalkless feather stars and stalked sea lilies.

合成为奥丰富的棘皮动物,有些是今天无柄羽星和有柄海合的祖先。

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