Definition
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letter
A letter is a written or printed message addressed to a person or organization, typically sent by mail.
信是指写给个人或组织的书面或印刷信息,通常通过邮件发送。
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I received a letter from my friend yesterday.
我昨天收到了朋友的信。
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She wrote a letter to apply for the job.
她写了一封信申请这份工作。
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The letter contained important information about the event.
信中包含了有关活动的重要信息。