鹦鹉螺的螺旋壳内部闪烁着珍珠般的光泽。

The ___nautilus's spiral shell shines with a pearly luster inside.

这艘名为鹦鹉螺的潜艇可以潜入海洋最深处。

The ___nautilus submarine can dive to the deepest parts of the ocean.