This seemed to make sense to the Italians and French who discussed it since the shell of this little ocean dweller was also smooth and white.
对于那些有过相关讨论的意大利人和法国人来说，这似乎是有道理的，因为此类海洋小生物的贝壳看上去同样光滑、白净。
When they have reached the size they want, they use an implement such as a rock or shell to smooth the surface of the pot.
参考译文：做出想要的尺寸时，他们用一个工具，比如一块石头或贝壳，将罐子的表面弄平滑。
The shell is smooth on the inside.
贝壳内壁光滑。
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