The problem with a mark-sweep algorithm is that it can lead to fragmentation (Figure 2).
“标记-清扫”算法的问题是可能会导致碎片（fragmentation），如图 2 所示。
The process has three major phases: mark, sweep, and compact.
这个过程有三个主要阶段：mark、sweep和compact。
In this type of GC, only the mark and sweep phases of GC are run.
在这类GC内，只运行GC的mark和sweep阶段。
In this type of GC, only the mark and sweep phases of GC are run.
在这类GC内，只运行GC的mark和sweep阶段。
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