dead letter
柯林斯词典
1. N-COUNT If you say that a law or agreement is a dead letter, you mean that it still exists but people ignore it. 空文
No one does anything about it and the law becomes a dead letter. 没人执行，该法律即成一纸空文。
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dead letter (dead letters)
剑桥词典
dead letter noun (MAIL)
[ 可数名词：有复数形式的名词 ]a letter that cannot be delivered to the address written on it and cannot be returned to the person who sent it
死信，无法投递的信件
the dead-letter office 死信处理办公室
dead letter noun (LAW/AGREEMENT)
[ 可数名词：有复数形式的名词 通常作为单数使用的名词 ]a law or agreement that is no longer effective
已失效的法律；形同虚设的协议；空文
The ceasefire treaty was a dead letter as soon as it was signed , as neither side ever had any intention of keeping to it. 由于双方缺乏遵守的诚意，停火协定一经签署就成了废纸一张。 返回 dead letter