在分布式系统中最常见的使用方式是消息队列系统。
The most common flavor used in distributed systems is a message queuing system.
我关注过使用消息中间件来进行远程调用的分布式系统。
I looked at distributed systems that used message oriented middleware to make remote procedure calls.
由于SNS系统的分布式特性，用户可能多次收到同一个消息。
A subscriber could receive a message multiple times due to the distributed nature of the SNS system.
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