practice parallelism
实践并行性
以上为机器翻译结果，长、整句建议使用 人工翻译 。
People can always make heaps that are difficult to collect in parallel, but in practice most large heaps have ample parallelism.
人们总是把堆搞得难以并发收集，但实际上大多数大型堆有足够的并发性。
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