它们都是增量型的(incremental)以缩短GC停滞的时间;它们还是分代的(generational)，所以短时对象(short-lived object)回收得更快。有些是并行的，从而回收工作可以在多个核上分开运行;甚至还有同时发生的Garbage Collection，这样就没有了停滞时间。
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The weak reference from the long-lived object to the short-lived object is kept long after the short-lived object has been destroyed.
在短周期对象销毁后，长周期对象对短周期对象的弱引用依然会长久保留下来。
The previously known most distant object was a short-lived gamma ray burst.
之前所知最遥远的天体是一次短期的伽玛射线暴。
An individual event object is short-lived, and exists only long enough for immediate processing before it ceases to be.
单个事件对象的存活期非常短，在其消失之前刚够时间进行即时处理。
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