Perforations are small holes that are made in something, especially in paper.
例句
Tear off the form along the perforations and send it to Sales...沿着纸孔撕下表格,寄给销售部。When held to the light the small oblong leaves are seen to possess tiny perforations.迎着光看时,就会发现椭圆形小叶子上有微小的孔眼。
英英词典释义
Noun
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)