three layer structure diagram top rock middle coal mixed area bottom rock
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Prompt
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Please draw a three-layer structure diagram. The top layer is rock, the middle layer is a coal seam → mixed area (coal + gangue), and the bottom layer is rock. There are no text elements in the image.
Prompt
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帮我画个三层结构图。上方石块，中层煤层 → 混合区域（煤 + 煤矸石），下方石块，图片中没有任何文字。