This option is useful if you have replica sets.

如果你有这个选项是有用的副本集。

youdao

Better replication: real time, replica sets, more options for data durability.

更好的复制功能：实时、复制集、更多数据耐久性选项。

youdao

The documentation talks a lot about metadata management and ways in which individual replica sets can implement it.

该文档大量谈及元数据管理和单独副本集对它的实现方式。

youdao

Ford recently raided a Chinese factory and turned up 7, 000 sets of counterfeit brake pads destined for Egypt, each stamped with a replica of Ford's blue oval.

FORBES: Stolen Cars