名词
中文翻译：信件
同义词：
['letter', 'missive', 'note']
例句：
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1. I need to write a letter to my friend in California.
我需要给在加利福尼亚的朋友写一封信。
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2. The postman delivered a missive from his boss.
邮差送来了一封来自老板的信。
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3. She sent a note to her sister asking for help with the project.
她给妹妹发了一封信，请求帮助完成这个项目。