phragmocone

常見(jiàn)例句

• a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae.
  烏賊的化石，圓錐形石灰質(zhì)化石，許多滅絕的頭足類動(dòng)物。
• a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae
  烏賊的化石，圓錐形石灰質(zhì)化石，許多滅絕的頭足類動(dòng)物
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