名词中文翻译
中文翻译：死信
同义词：
['unclaimed mail', 'undeliverable letter']
例句：
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1.I received a dead letter from my ex-wife last week.
我上周收到了一封无法送达的来自前妻的信。
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2.The post office promised to deliver the package within two days, but it never arrived.
邮局承诺在两天内送达包裹，但一直没到。
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3. The sender's address was incorrect, so the letter was returned as a dead letter.
寄件人地址有误，所以这封邮件被退回作为无法送达的信件。