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。
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。
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。
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。
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。
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。
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。
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。
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。
The DictionaryIO class has a single method, export , which expects a Dictionary object and USES it to output a dummy message.
dictionaryio类具有单个方法export，它接受一个Dictionary对象，并使用它来输出假消息。
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。
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。
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。
One reason is that you may wish to have one DictionaryIO object work with multiple Dictionary objects and to store a separate reference to it.
一个原因是您可能希望一个DictionaryIO对象使用多个Dictionary对象，或者希望存储该对象的单独引用。
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。
You may be wondering why the Dictionary object doesn't just instantiate its own DictionaryIO object, or even just handle import-export operations internally without recourse to a second object at all.
您可能会疑惑为什么Dictionary对象不仅实例化自己的DictionaryIO对象，或者甚至在内部处理导入导出操作，而根本不求助于第二个对象。
Additionally, ADC only occurs if no compression dictionary exists within the physical table data object or partition.
此外，只有当物理表数据对象或分区中没有压缩字典时，才能运行adc。
Changing these values would change the hash code, which would in turn break any hash table or dictionary that the object happened to be stored in.
而改变那些值的同时也改变了哈希码，然后会破坏一些哈希表或者恰好储存了对象的字典。
Rather than serializing the object, pull the data out of the object and put it into a dictionary. Then serialize the dictionary.
不要序列化对象本身，而是把数据从对象中提取出来，放到一个字典里，然后再序列化那个字典。
Listing 1 is a version of the Dictionary class that accepts a DictionaryIO object and stores it for later use.
清单1是Dictionary类的一个版本，它接受一个DictionaryIO对象，并将其存储以备将来使用。
The summarize method is invoked via a Dictionary instance using the object operator.
summarize方法是通过Dictionary实例使用对象操作符调用的。
To take advantage of the clear interface offered by a class, you need to know your object is actually an instance of Dictionary and not some imposter.
要利用类提供的清晰接口，需要知道您的对象实际上是Dictionary的一个实例，而不是某个imposter。
Another reason is that by passing a DictionaryIO object to Dictionary, you can take advantage of class switching, or polymorphism.
另一个原因是通过将DictionaryIO对象传递给Dictionary，可以利用类切换或多态性。
Dictionary knows only that it must have a DictionaryIO object, and that it is therefore guaranteed export and import functionality.
Dictionary只知道它必须具有一个DictionaryIO对象，从而保证export和import的功能。
Such objects have a field that points to the "Class" object that holds the dictionary for the object's type.
这些对象都有一个指向“类”对象的字段（Field），而“类”对象属于对象类型字典里某种类型。
This makes a difference when the default is a mutable object such as a list, dictionary, or instances of most classes.
当默认值是一个可变对象，诸如链表、字典或大部分类实例时，会产生一些差异。
An object that appears in a dictionary as the second part of a key-value pair. This is more specific than our previous use of the word "value".
键值：字典中的一个对象，键值对的第二部分。这个和之前提到的值不同，在字典使用过程中指代的是键值，而不是数值。
Even though I imported the dictionary module, I still need to qualify object instances, hence the dictionary: : Word qualification.
尽管导入了dictionary模块，但是仍然需要对对象实例进行限定，因此采用dictionary：Word。
A dictionary in Objective-C is an object that holds two sets of information, a unique key and associated values, and enables you to use the key to retrieve items.
Objective - c中的字典是一个具有两组信息(惟一的密钥和相关的值)的对象，且使您能够使用该密钥来检索条目。
Most of the time, a custom object that implements only a subset — even a fairly small subset — of, for example, the methods of a built-in dict are dictionary-like enough for purposes at hand.
大部分情况下，只实现了比如内置的dict类型的方法的一个子集——甚至是相当小的子集——的自定义对象，就足够“类-dictionary”而可以满足当前的要求。
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