perforation
noun uk/ˌpɜː.fərˈeɪ.ʃən/ us/ˈpɝː.fəˈreɪ.ʃən/
[ C ]孔
a hole in something
A tea bag is full of tiny perforations. 茶包上满是小孔。
[ C or U ] medical specialized穿透膜（或组织的）孔;在膜（或组织）上穿的孔
a hole that goes all the way through a membrane or tissue or the act of making a hole like this
One possible complication of colonoscopy is a perforation through the bowel wall that could require surgery. 结肠镜检查的一个可能的并发症是大肠穿孔，必须靠手术解决。