常见例句Silk of Dupion with Special Defect and the Product Quality 雙宮絲的特殊疵點與産品質量Necessary Work of Implementation New Standard of Dupion in Sichuan 四川實施雙宮絲新標準應做好的幾項工作dupion cocoon reeling 雙蠶繭繅絲機 返回 dupion