Selected material, to sawn ivory films, shape file, and then polished with sandpaper 6 times, and then the surface of ivory black ink will be dry after.
选定材料后，要把象牙锯成片、锉成形，然后用砂纸打磨6遍，再用墨汁将象牙表面涂黑后晾干。
Millstone, sandpaper, nail file, granite surface, concrete walls and floors above all contains material, will be scratched surface of these materials.
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。
First of all, to deal with some spraying petrol, acetone for degreasing treatment with a file, fine sandpaper, oilstone will fatigue layer and oxide layer removed to expose the metal color.
首先应对喷涂部分用汽油、丙酮进行除油处理，用锉刀、细砂纸、油石将疲劳层和氧化层除掉，使其露出金属本色。
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