Ten-armed oval-bodied cephalopod with narrow fins as long as the body and a large calcareous internal shell.
卵形身体的十肢头足类动物，窄的鳍和身体一样长，钙质内壳大。
The strength calculation of ring-stiffened cylindrical shell of oval cross section under uniformly-distributed external pressure is a complicated problem in mechanics.
均布外压下带肋椭元柱壳的强度计算是一个比较复杂的力学课题。
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