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。
The dangerous type chronic otitis media occurs with pars flaccida and marginal perforations.
慢性中耳炎的危险型可出现鼓膜松弛部的穿孔和鼓膜边缘性穿孔。
Close inspection shows that they are wearing masks with tiny perforations around the eye and nose area for seeing and breathing.
据近距离观察，原来他们戴了面具，眼部和鼻子附近有许多方便观看和呼吸的小孔。
The elaborately decorated and enamelled body, exquisitely painted in pastel yellow and blue, contains an inner vase that can be viewed through the perforations.
精心装饰的粉彩瓶身，由黄蓝粉彩精巧绘制，有一个内瓶，可以透过镂空的孔观看。
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