石材与金属之间的退缝

提示词

石材与金属交界保留一条有进深的退缝，两侧材料各自收边，缝内暗部有厚度，不用黑色描线代替接合关系。

Retain a recessed joint where stone meets metal, with each material terminating separately and a visibly deep shadow gap rather than a painted black outline.