The tenured collectors all use a mark-sweep-compact algorithm.

老年区收集器都使用了标记扫 描压缩（mark-sweep-compact）算法。

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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。

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The copying algorithm has excellent performance characteristics, but it has the drawback of requiring twice as much memory as a mark-sweep collector.

复制算法的性能很优异，但是它有一个缺点是需要两倍于标记-清除收集器所需要的内存。

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