海胆纲

  • 网络ECHINOIDEA;sea urchins
海胆纲海胆纲
  1. “海胆:一种属于海胆纲的棘皮动物,包括沙钱和海胆.”

    " echinoid : an echinoderm of the class Echinoidea , which includes the sand dollars and sea urchins . "