The cells in the center of the ducts with comedocarcinoma are often necrotic and calcify, as shown here.
如图，在有粉刺癌的常为坏死性与钙化的。
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Why it starts to calcify though still remains a bit of a debate, though?
不过，胆囊钙原因尚有争议。
They then cover the outside of the marble with enzymes, drawing the bacteria out to the surface where it calcifies, strengthening the stone.
然后他们用酶覆盖大理石外部，将细菌吸引到钙，使大理石更加坚固。
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划词翻译
详细解释
常为坏死性与钙化的。
原因尚有争议。
合集
，使大理石更加坚固。
