core steinkern
基础科学

        Definition: Rock material formed from consolidated mud or sediment that filled a holloworganic structure,such as a fossil shell. The fossil formed after dissolution of the mold.内核nèihé指生物遗体中空部分的充填物,如双壳类和腕足类常形成内核化石,其表面为外壳的内模......（本文共 365 字）     [阅读本文] >>