class graphics的用法和样例：
例句
- You will see the abstractions added to the class diagram.
之后您将会看到提取出来的内容被添加到类图中了。 - For example, many beginners read some information about OO, and suddenly the class diagrams to their simple applications look like the Eiffel Tower.
比如说，许多初级者读了一些有关面向对象的信息后，突然间，他们那简单的应用程序的类图看起来就像埃菲尔铁塔一样了。
