n.拳打
动词punch的现在分词形式.
They cut holes on the sheet of metal with a punch press. 他们用冲床在金属板上打孔。
Small pieces of paper or cardboard generated by punching holes in paper tape or data cards. 孔屑在纸带或数据卡片上打孔所产生的小纸屑或硬纸片
