Explains the differences between foreground and background threads.

解释了前台和后台线程的区别。

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Often, keeping track of the background threads in this kind of environment can be a challenge.

通常，在此类环境中跟踪后台线程会是一项挑战。

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Using this method, you could run multiple background threads to increase concurrency on your Artist indexing.

使用这种方法，你可以运行多个后台线程来提高你的艺术家索引的并发性。

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