Functional programming forbids code with side effects. Side effects and concurrency don’t mix. You can have sequential code with side effects, or you can have code and concurrency that is free from side effects.You have to choose. There is no middle way.引自 Chapter 1 Begin
（小恶魔：side effects到底是什么嘛，不说清楚，银家肿么知道捏，讨厌啦）
Erlang is a language where concurrency belongs to the programming language and not the operating system. 引自 Chapter 1 Begin
表示其中内容是对原文的摘抄