(角色表演复习对话) 3.Demonstrate new concepts(实物示范) Ask for volunteers to show you the top,bottom,left and right of objects in the classroom.（单词运用） .
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This article describes a new method to design and implement a progress bar and USES a simple application to demonstrate the main concepts.
详细描述了一种进度条的设计与实现方法，运用一个简单的应用程序示范了其设计思想。
At the end of this paper, three examples are given to demonstrate the importance of these new concepts.
在文章的最后部分，通过三个不同的例子，我们说明了以上新的定义方式的重要性与有效性。
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