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	non-erotic nones none-so-pretty non esse non-essence non-essential non est non est factum non est inventus nonesuch Nonesuch chest Nonesuch ornament nonet none the less nonetheless none the worse for none too none too —— non-Euclidean non-European non-evaluative non-event no news is good news non-excessive non-exclusive

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