名词
中文翻译：发送者
同义词：
['sender', 'recipient', 'addressee']
例句：
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1. The sender of the letter is required to sign it.
寄信人需要在信件上签名。
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2. The addressee was not able to receive the package due to a courier error.
收件人由于邮递错误未能收到包裹。
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3. The sender's name and address should be clearly indicated on the envelope.
信封上应该清楚地标明寄件人的姓名和地址。