upholstery nail ; sofa nail
珍珠小灯泡耳钉 pearl light bulb stud earrings
清代绵甲，用棉布和棉花制成，并饰有排列整齐的金属泡钉，以增强防护效能。
Padded Armor of Qing Dynasty was made of cotton cloth and cotton and provided with lines of metal blister nails to increase its protective capability.
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