GbEng
钮扣有时是用骨头做的. Buttons are sometimes made of bone.
请你在这件衬衫上钉一颗钮扣好吗? Will you stitch a button on this shirt?
丝线一段毛线、粗线或丝线,尤指主要用来缝合钮扣孔的结实丝线 A length of yarn, cord, or thread, especially a strong silk thread used mainly to bind the edges of buttonholes.