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.
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。
2
In addition, the policies spell out how messages should be retained, migrated, classified, and prioritized.
另外，这些策略还规定了应该如何对这些消息进行保持、迁移、分类和设定优先级。
3
The scientists believe some modern humans migratedout of Africa 67, 500 years ago.