双语例句
Time was when monitoring a suspected dead-letter box involved laborious work by humans.
过去，监视一个可疑死信投递点全靠人力艰苦作业。
词典释义：
dead letter box
时间: 2026-02-24 17:39:50
英
美
n.秘密情报存取点；密件投递处
词典释义：
n.秘密情报存取点；密件投递处
Time was when monitoring a suspected dead-letter box involved laborious work by humans.
过去，监视一个可疑死信投递点全靠人力艰苦作业。