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。
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。
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.
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