Each of these databases has its own database client tools which are all different.

这些数据库都具有各自不同的数据库客户机工具。

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One of the most important of these tools is the database.

其中最重要的工具之一就是数据库。

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One of the most important of these tools is the database.

其中最重要的工具之一就是数据库。

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