pen pal
noun /ˈpen pæl/
  /ˈpen pæl/
(especially North American English) (British English also penfriend)
- a person that you make friends with by writing letters or emails, often somebody you have never met
| 单词 | pen pal | 
| 释义 | pen palnoun /ˈpen pæl/  /ˈpen pæl/(especially North American English) (British English also penfriend) 
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