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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There are several basic strategies for garbage collection: reference counting, mark-sweep, mark-compact, and copying.

有几种垃圾收集的基本策略：引用计数、标记-清除、标记-整理 (mark-compact) 和复制。

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The same mark-sweep-compact collector is used, but much of the mark and sweep phases can be done as the application runs.

这种策略也使用 “标记-清扫-压缩 (mark-sweep-compact)” 收集器，但大部分标记和清扫工作可以在应用程序运行时执行。

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Trott, moved up the order to open to allow England to play five bowlers, took 33 balls to get off the mark and his reluctance to play any form of sweep to a spin-oriented attack saw the innings grind virtually to a halt.

BBC: England on back foot against Bangladesh in Mirpur

After he skewed one and JP Duminy was lbw cheaply having missed a sweep, the redoubtable Mark Boucher shared 78 with Amla before mis-timing to cover which brought about the declaration.

BBC: Hashim Amla hits double ton as South Africa lead India

Tillakaratne Dilshan lifted the hosts past the 200-mark with an enterprising 44 from 46 balls before being bowled in the penultimate over while attempting an ambitious reverse sweep.

BBC: SPORT | Cricket | England safe after Pakistan win