最后，对该三层结构方法在地学中的应用做出总结。
Finally, the application of three-layer structure method in geoscience is discussed.
结合三层结构方法，文章对一些常见的面向对象界面现象进行了探讨。
Combining with the method, the paper also discusses some phenomena happened in object-oriented GUI design.
教学形式系统可分为三个层级：最顶端为教学风格；第二层为教学策略、教学模式；第三层最为丰富，包括教学手段、教学方法、教学语言、教学程序、教学结构等等。
The top level of it is teaching styles, the second level is teaching strategy and mode, the third level involves teaching means, method, language, procedure and structure and so on.
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