名词
中文翻译：笔友
同义词：
['pen-pal', "pen-mate例句：1. I've been writing to my penfriend in Japan for over a year now.（我已经给我在日本的笔友写了一年多的信了。）"]
例句：
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1. I've been writing to my penfriend in Japan for over a year now.
我已经给我在日本的笔友写了一年多的信了。
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2. She decided to write a letter to her penfriend in the United States.
她决定给她在美国的笔友写一封信。
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3. They exchange letters and emails with their penfriends from different countries.
他们与来自不同国家的笔友交换信件和电子邮件。