制作过程包括30步，涉及创作具有不同厚度的四个不同层次，每一层都必须单独建立。
The fabrication consisted of a 30-step process and involved creation of four different layers with differing thicknesses, each of which had to be created separately.
制作过程包括30步，涉及创作具有不同厚度的四个不同层次，每一层都必须单独建立。
The fabrication consisted of a 30-step process and involved creation of four different layers with differing thicknesses, each of which had to be created separately.
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