名词
中文翻译：书信
同义词：
['letter', 'missive', 'note']
例句：
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1. He sent a letter to his friend asking for help.
他给朋友寄了一封信寻求帮助。
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2. The letter arrived in the mail yesterday.
昨天信函到达了。
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3. She wrote a missive to her sister expressing her love and gratitude.
她写了一封密信给她姐姐表达她的爱和感激之情。