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	polydesoxyribonucleotide Polydeuces polydiene polydigital polydimensional polydipsia polydisperse polydispersed polydispersity polydomous polydrug polydymite polydynamic polyelectrolyte polyelectronic polyembryonate polyembryonic polyembryony polyemia polyendocrine polyendocrinopathy polyene polyenergid polyenic polyenoic

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