北京从“大而全”转向“高精尖”，天津以“引得来”巩固“发展好”，河北用“接得住”实现“升级跳”，得益于京津冀协同发展战略的深入推进。
Since Mongo is schemaless, there is no need to specify schema, only collections must be created. Same for indexes - these are just classic (B-tree) indexes that work on any field type.
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Англия — Премьер-лига|29-й тур。业内人士推荐电影作为进阶阅读
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