我一直在想你，所以写下这封，永远无法送达的信。
I have been thinking about you. I write this letter knowing it will probably never reach you.
第八十四条受送达人下落不明，或者用本节规定的其他方式无法送达的，公告送达。
Article 84 if the whereabouts of a recipient is unknown, or if a document cannot be served by the other methods prescribed in this section, the document shall be served by public announcement.
这个参数可控制在确定消息无法送达其目标队列之前将进行重试的次数。
This parameter controls the number of times a message will be retried before determining that a message cannot be delivered to its target queue.
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