subdorsal line ; addorsal line
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其次，它会保护镶嵌，内饰线和音孔饰圈等不会相互染色，特别是来自背侧板的油脂和颜色。
Second, it will help protect the inlays, purflings, and the rosette from color contamination due to the oils and dyes in the back and sides of the classical guitar.
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