单词：perforations
音标：[pɜ:fə'reɪʃnz] ；
n. 穿孔( perforation的复数形式 ); 贯穿; 针孔; 齿孔
n. a line of small holes for tearing at a particular place
n. a hole made in something
n. the act of punching a hole (especially a row of holes as for ease of separation)
n. a hole made in something
n. the act of punching a hole (especially a row of holes as for ease of separation)
perforations的用法和样例：
例句
- Tear the sheet of stamps along the perforations.沿齿孔把邮票撕开。
- Grooves extend to the finished edge, but rear perforations are not visible.凹槽延伸到成品的优势，但后排齿孔中不可见。