与逻辑层系统的灵活性相比，物理层的面向对象的系统显得有些脆弱。
When compared to the flexibility of a logical system, physical level object-oriented systems appear brittle.
它在过程化的dbi层之上提供了一个完全面向对象的接口。
It presents a clean object-oriented interface on top of the procedural DBI layer.
显而易见，操作层由EAI打包的应用程序、遗留、老式的面向对象及商业智能应用程序组成。
It is obvious that the operational layer can consist of EAI packaged applications, legacy, older object-oriented, and business-intelligence applications.
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