The VirtualSystems class (Listings 4 and 5) implements methods to return all the necessary values, wrapping the dictionary object inside.

VirtualSystems类（清单4和5）实现了返回所有必要值的方法，并封装了字典对象。

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A dictionary display yields a new dictionary object.

使用一个字典会生成一个新的字典对象。

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This class implements a dictionary, and you can add items to it or remove items from it as you would any dictionary object.

此类实现一个字典，可以像对待任何字典对象那样从其中添加或移除项。

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Listing 2 shows that a Dictionary object now has more to it.

清单2显示Dictionary对象现在具有更多成员。

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The export method takes the data from a Dictionary object and writes it to an XML file.

export方法从Dictionary对象中取得数据，并将其写入XML文件中。

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You know that any Dictionary object will have been initialized with the required arguments.

所有Dictionary对象都已经用必需的参数初始化过了。

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As you can see, there is no need to instantiate a Dictionary object to access this property.

正如所看到的，访问该属性无需实例化Dictionary对象。

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After the Dictionary object is loaded, you can look up meanings of words whose definition you need.

加载Dictionary后就可以查看所需单词的定义了。

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A Dictionary object always has a get method, whether an instance of Dictionary itself or of a child class.

Dictionary对象总是具有get方法，而不管它是Dictionary本身还是其子类的实例。

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To instantiate a Dictionary object, you need to pass a type string and a DictionaryIO object to its constructor.

要实例化Dictionary对象，需要将类型字符串和DictionaryIO 对象传递给它的构造函数。

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The first time you encounter a Dictionary object in a calling method, you can check its type before working with it.

在调用方法中第一次遇到Dictionary对象时，可以在使用它之前检查它的类型。

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The constructor USES these parameters to set its own properties. Here is how you might now instantiate a Dictionary object.

构造函数使用这些参数来设置自有属性。

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To recap, it takes data from a Dictionary object, writes it to the file system, takes data from a file, and merges it back into a Dictionary object.

扼要重述一下，它从Dictionary对象中获取数据，将其写入文件系统，从一个文件中获取数据，将其合并回到Dictionary对象中。

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To recap, it takes data from a Dictionary object, writes it to the file system, takes data from a file, and merges it back into a Dictionary object.

扼要重述一下，它从Dictionary对象中获取数据，将其写入文件系统，从一个文件中获取数据，将其合并回到Dictionary对象中。

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