They belong to that species of molluscous perforatorswhich excavate holes in the hardest stone; their shell is rounded at bothends, a feature which is not remarked in the common mussel.
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美
释义
它们属于穿孔类软体动物,能在最坚硬的岩石中挖洞;它们的外壳两端浑圆,这是一般贻贝所没有的特征。
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