per·fo·ra·tion /ˌpɝfəˈreʃən/
  穿孔,貫穿,貫通
  per·fo·ra·tion /ˌpɝfəˈreʃən/ 名詞
  穿孔,穿破,穿孔術
  perforation
  打孔率
  perforation
  折頁線;打孔眼線	P
  perforation
  打孔
  Per·fo·ra·tion n.
  1. The act of perforating, or of boring or piercing through.
  2. A hole made by boring or piercing; an aperture. “Slender perforations.”
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  perforation
       n 1: a line of small holes for tearing at a particular place
       2: a hole made in something; "a perforation of the eardrum"
       3: the act of punching a hole (especially a row of holes as for
          ease of separation)