perforation

中文： 打眼、打孔、钻孔、穿孔

1. The act of perforating or the state of being perforated. (countable, uncountable)
2. Any opening in a solid object. (countable, uncountable)
3. An abnormal opening in an organ, such as a rupture. (countable, uncountable)
4. A series of holes punched through something in order to assist in separating parts. (countable, uncountable)
5. That portion of a surface that remains after an open disk is removed from it. (countable, uncountable)

复数 perforations