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单词
sea urchin
释义
sea ur
chin
noun
A marine echinoderm having a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws.
Class
Echinoidea
.
The sea urchin is one of the few marine organisms whose genome has been sequenced.
...
The inner shell of a sea urchin is a hollow globe, scored in five curved sections that taper at the ends into a small hole at the top and bottom.
The red sea urchin's body is domed above and flat below.
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更新时间:2025/3/22 15:45:44