perforation
/pɜːfəˈreɪʃən/noun
1- a hole made by boring or piercing; an aperture passing through or into something孔, 孔眼：
the perforations allow water to enter the well.
小孔使得水能流进井里。
1.1
- a small hole or row of small holes punched in a sheet of paper, e.g. of postage stamps, so that a part can be torn off easily齿孔, 孔眼线。
1.2
- mass noun the action or state of perforating or being perforated穿孔, 打孔; 穿透; 穿入：
there was evidence of intestinal perforation.
有肠穿孔的迹象。
词源
late Middle English: from medieval Latin perforatio（n-）, from the verb perforare （see PERFORATE）.