ECO can use any relational database to persist objects, but it is especially well-suited to IBM DB2 UDB.

ECO可以使用任何关系数据库来存储对象，但特别适合使用IBMDB 2UDB。

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For example, reflection is often used in frameworks that persist objects to databases, XML, or other external formats.

例如，反射经常在持续存储对象为数据库、XML或其它外部格式的框架中使用。

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And when you persist objects, they can only be persisted in the same atomic transaction if they are in the same entity group.

并且在持久化对象时，如果它们在相同的实体群中，那么它们只能被持久化到相同的原子事务中。

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For all of these reasons, relational databases offer what we might call a noticeable impedance mismatch when we try to use them to persist objects in a dynamic language like Python.

由于所有这些原因，在尝试使用关系数据库来持久化诸如python等动态语言中的对象时，关系数据库导致了显著的不匹配。

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For all of these reasons, relational databases offer what we might call a noticeable impedance mismatch when we try to use them to persist objects in a dynamic language like Python.

由于所有这些原因，在尝试使用关系数据库来持久化诸如python等动态语言中的对象时，关系数据库导致了显著的不匹配。

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