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nuclear whorl /ˈnɒtʃt ˈsɪŋɡəlˈɛdʒd ˈθɪnɪŋ ˈsɪsəz/ n

中文：初螺层

中文 · 初螺层Español · espiral embrionariaFrançais · tour embryonnaire
Meaning：First complete turn of the shell formed at the larval stage.
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Single shell

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