However, these DBMSs were complex and required people with considerable technical knowledge to understand them, much less design and manage them.

然而，这些DBMSs很复杂，需要具有相当多技术知识的人来理解它们，更不用说设计和管理它们了。

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Another fundamental difference is that document-oriented databases don't provide strict relationships between documents, which helps maintain their schema-less design.

另一个基本差异是面向文档的数据库不在文档之间规定严格的关系。这有助于维护它们的非模式化设计。

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Another fundamental difference is that document-oriented databases don't provide strict relationships between documents, which helps maintain their schema-less design.

另一个基本差异是面向文档的数据库不在文档之间规定严格的关系。这有助于维护它们的非模式化设计。

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