It increases the maintainability and extensibility of the system.

增加了系统可维护性、可扩展性。

The design of application model incorporates OOP methodology, and gives full consideration of extensibility.

应用模型的设计采用面向对象的程序设计思想，充分考虑了可扩充性。

It has the intensity and the extensibility properties of the steel as well as the merit of the glass, such as bearing the acid or alkali corrode, easy to be cleaned and so on.

它兼有钢的强度、延伸性和玻璃的耐酸碱腐蚀、不易污染产品、容易清洗等优点，它可以赋予材料表面耐磨、耐蚀、耐热、耐辐射、以及光、电、热、磁等特殊性能，从而达到提高使用性能、延长使用寿命的目的。