名词
中文翻译：信件
同义词：
['letter', 'communication', 'message']
例句：
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1. I've received a letter from my friend in New York.
我收到了来自纽约朋友的一封信。
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2. She wrote a long letter to her sister about their upcoming trip.
她给姐姐写了一封长信，描述了即将到来的旅行。
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3. The postman delivered the mail and also answered letters for the residents.
邮递员收发邮件，还为居民解答信件。