A few special keys are used in NLTK, different ones by the various subpackages.
在NLTK中使用了一些专门的键，不同的键由不同的子程序包所使用。
Other subpackages represent data objects that are sent on calls or received from the server.
其它子包表示在调用中发送或接收来自服务器的数据对象。
The docutils package consists of quite a few subpackages, in fairly complicated relation to each other.
docutils软件包包含很多子软件包，各子软件包之间的关系相当复杂。
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