- Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a round, symmetrical, calcareous shell covered with long spines.海胆：任一种棘皮纲的棘皮动物，具有被圆形对称的螺旋状贝壳包含的柔软躯体，贝壳表面布满棘刺
- dactylologies
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