答案就是：每一个对象或AutoCAD中的实体实际上都有一个名为’扩展字典（Extension Dictionary）’的可选字典。我们可以把扩展记录直接加入到这个字典中。
基于8个网页-相关网页
Dictionary Search: Take the mystery out of those big words with this extension that allows you to simply highlight a word and get a definition instantly without even leaving the page you're browsing.
Dictionary Search：摆脱谜一般的长单词的困扰吧！ DS让你在选中单词时即可得到定义，甚至不用离开你正在浏览的网页。
Each extension should use a unique key to use to store state in the dictionary.
每个扩展需要一个唯一键用于在字典中保存状态。
Understand the Named Objects Dictionary and Extension Dictionaries.
明白对象词典和扩展词典。
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