dead letter

• n. (无法投递的)死信；形同虚设的规定

英英释义

Noun:

1. the state of something that has outlived its relevance

2. mail that can neither be delivered nor returned

例句

用作名词 (n.)

1. The name of the exception class for the player to activate and play back before the message is routed to the dead letter queue.
   用于在消息被路由到死信队列之前由播放机激活并播放的异常类的名称。

近反义词

【近义词】

• non-issue 不重要的事
• dead mail 无法投递的信件...