名词
中文翻译：书信
同义词：
['letter', 'missive', 'correspondence例句：1. He wrote a letter to his friend asking for help.（他给朋友写了一封信，请求帮助。）']
例句：
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1. He wrote a letter to his friend asking for help.
他给朋友写了一封信，请求帮助。
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2. She received a missive from her sister in the mail.
她在邮件中收到了姐姐的来信。
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3.They exchanged letters regularly to keep in touch.
他们定期交换信件以保持联系。