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单词 calcareous shell
例句 DEFINITIVE EXAMPLES 权威例句〔sea urchin〕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,贝壳表面布满棘刺美国传统〔seashell〕The calcareous shell of a marine mollusk or similar marine organism.海贝壳:海栖软体动物或类似的海洋生物的钙质贝壳美国传统
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