Erlang 以 “进程” 为前提，如同轻量级线程（而不像操作系统进程），但是不直接映射到本地线程。

Erlang assumes a world of "processes," which are like lightweight threads (not like operating system processes) but do not map directly to native threads.

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一方面，线程是轻量级的，并且相互之间易于通信，但另一方面，它们也带来了包括死锁、争用条件和高复杂性在内的各种问题。

On one hand, threads are lightweight and easy to communicate with, but on the other hand, they bring up a whole host of problems including deadlocks, race conditions, and sheer complexity.

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这些线程通常都是轻量级的，用于执行缓存清理和对象清理之类的事务。

They are traditionally lightweight and used for executing tasks such as cache cleanup and object cleanup.

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