The category of the building material is numerous, the ring is metals material, such as steel, aluminum material, copper material.
建筑材料的种类繁多，有金属材料如钢铁、铝材、铜材；
The category of the building material is numerous, the ring is metals material, such as steel, aluminum material, copper material.
建筑材料的种类繁多，有金属材料如钢铁、铝材、铜材；
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