physical record deletion
... 实体保护 physical protection 实体记录删除 physical record deletion 实体记录长度 physical record length ...
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这种机制（超出了这个模式范围）将周期性地运行，以删除那些不应该从备用源迁移到首选源的实体记录。
The mechanism (out of scope for this pattern) would run periodically to remove entity records that shouldn't be migrated from an alternate source to the preferred source.
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