分布式数据库安全的核心技术是用户身份验证和访问控制。

The essential security technologies of the distributed database are user authentication and access control.

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分布式对象构造技术是实现分布式数据库系统的基础，而数据库访问技术是开发分布式数据库系统的关键。

Distributed object construction technique is the foundation to achieve distributed database system function, and the technique of accessing database is the key to achieve distributed database system.

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移动计算技术的飞速发展，使得用户通过移动客户机随时随地访问分布式数据库上的信息成为可能。

Rapidly advancing in mobile computing makes it possible that people can access information in distributed database by mobile client anywhere at any time.

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