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.
随便看	object program object pronoun object relations object-relationship objects clause object-soul object teaching objectual object white object word object world objet objet d'art objet de luxe objet de vertu objet de virtu objet trouvé objure objurgate objurgation objurgative objurgatory obl. oblanceolate oblast

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