It is called the dead letter office. The letters are not written clearly, so the mailmen cannot read the addresses.
那里被称为死件办公室。信写得不清楚，所以邮递员看不清地址。
dead letter
英汉-汉英词典
死信（无法投寄的信）；形同虚设的规定
词组 | 习惯用语
您要查找的是不是：
Dead latter 硬核朋克
Dead Letter Perfect 唱片名
Dead Letter Office 死信办公室；恋恋情书；死信招领处；无信邮局
dead letter queue 无用字母队列；死信队列
dead letter file 死信文件
a dead letter 一纸空文；官样文章
Dead Letter Box 死信箱
dead letter detail 名存实亡的风俗习惯
remain a dead letter 石沉大海
dead letter 死信（无法投寄的信）；形同虚设的规定
原声例句
VOA Special 2018年5月合集
英语百科
Dead letter mail
（重定向自Dead Letter）
Dead letter mail or undeliverable mail is mail that cannot be delivered to the addressee or returned to the sender. This is usually due to lack of compliance with postal regulations, an incomplete address and return address, or the inability to forward the mail when both correspondents move before the letter can be delivered. Largely based on the British model that emerged in the late eighteenth century, many countries developed similar systems for processing undeliverable mail.
近义、反义、联想词
近义词
n.state, letter, missive
英英词典
dead letter n.
- the state of something that has outlived its relevance
- mail that can neither be delivered nor returned
synonymous： non-issue
synonymous： dead mail
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