单词	sea urchin
释义	sea urchin 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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