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A nail for fixing the foil in position has a spherical shaped head and in its concavity merges with a saw-tooth barbed pin with a radius. 一個固定薄膜位置的釘子具有一個球麪形的頭部竝用一個沖制的圓段過度到鋸齒狀設置的杆部上。 gongye168.com