磨石、砂纸、指甲锉、花岗石面、混凝土墙面及地面等均含有以上物质，会刮花这些材料的表面。

Millstone, sandpaper, nail file, granite surface, concrete walls and floors above all contains material, will be scratched surface of these materials.

youdao

磨石、砂纸、指甲锉、花岗石面、混凝土墙面及地面等均含有以上物质，会刮花这些材料的表面。

Millstone, sandpaper, nail file, granite surface, concrete walls and floors above all contains material, will be scratched surface of these materials.

youdao