基本解释[动力与电气工程]死信箱[计算机科学技术]死信箱英英字典柯林斯英英字典 a place where messages and other material can be left and collected secretly without the sender and the recipient meeting dead-letter box剑桥字典dead-letter box柯林斯字典专业释义动力与电气工程死信箱计算机科学技术死信箱