裂缝(cracks)也包括空洞(holes)、穿孔(perforations)、微孔(pores)或裂纹(lines)。 粘合(adhesion)意指两种不同的材料相粘接，而内聚(cohesive)意指抗分开的一块物质。
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no perforations on any side 任何一方无齿孔
Tympanic membrane perforations 鼓膜穿孔
Codification for designating perforations 孔目符号标示法
"a perforation of the eardrum"
以上来源于: WordNet
N-COUNT Perforations are small holes that are made in something, especially in paper. 小孔 [usu pl]
Tear off the form along the perforations and send it to Sales.
沿着打的孔撕下表格，寄给销售部。
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