A second pass then sweeps away the unmarked objects, leaving behind free memory than can be used for new allocations.

然后，第二轮访问扫除未标记的对象，将未使用的闲置内存留作新分配之用。

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Homework assignment: Can you guess what would happen if I specified tracegroups for this second pass as well?

家庭作业：如果我第二遍又指定tracegroups，您能猜出将发生什么吗？

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Step 2. Begin a second pass at the code migration.

开始进行代码迁移的第二步。

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