参考词典中dead letter的常规释义:
基本释义
- n.(无法投递的)死信,形同虚设的规定
英英解释
2个名词解释
- the state of something that has outlived its relevance
[同] dead letter, non-issue - mail that can neither be delivered nor returned
[同] dead letter, dead mail
点击查看……- the state of something that has outlived its relevance







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