Background GC is to replace concurrent GC.

后台垃圾收集是来替代并发垃圾收集。

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Meanwhile, one or more background GC threads will use idle cycles to get additional work done.

与此同时，会有一个或多个背景 GC 线程使用闲置周期完成余下的工作。

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After this foreground GC is finished, the background GC thread and the user threads can resume their work.

在前台垃圾收集完成之后，后台垃圾时线程和应用程序的线程就继续它们的工作。

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