dead smooth file 最细锉 ; 光锉 ; 油光锉
triangular smooth file [机] 细三角锉
smooth cant file 细斜锉
smooth flat file 细扁锉
You have to file away for hours to get this metal smooth.
你要想你这块金属光滑，必须用锉刀不停地锉上几小时。
The file hard (60rc) high strength aluminum alloy tube provides a smooth corrosion free sealing surface and excellent abrasion resistance.
文件的硬(60rc)高强度铝合金管提供了一个平稳无腐蚀密封面和良好的耐磨性。
The file hard (60RC) high strength aluminum alloy lobe tube provides a smooth, corrosion-free abrasion-resistant sealing surface.
文件的硬（60RC）高强度铝合金叶管提供了一个平滑，无腐蚀耐磨密封面。
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