角色模型是一种不同的并发进程建模方式。
The actor model is a different way of modeling concurrent processes.
因为由语言(而不是操作系统)控制并发机制，所以生成数千甚至数百万个进程是很普通的。
Spawning thousands or millions of processes is quite normal, because the languages controls the concurrency mechanism not the operating system.
分布式应用程序需要一个定义两个并发进程间通信机制的协议。
Distributed applications require a protocol which defines the communication mechanism between two concurrent processes.
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