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Từ điển WordNet v3.1 - WordNet Dictionary
perforation
1. a line of small holes for tearing at a particular place (Freq. 1)
• Derivationally related forms:
perforate
• Hypernyms:
hole
2. a hole made in something
- a perforation of the eardrum
• Derivationally related forms:
perforate
• Hypernyms:
hole
3. the act of punching a hole (especially a row of holes as for ease of separation)
• Derivationally related forms:
perforate
• Hypernyms:
puncture
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