在本文中描述的功能改善，提高了序列图的可用性，因此使得您可以更加容易的编辑和变更您的图表。
The enhancements described in this article improve the usability of the sequence diagram, thus making it easier for you to edit and modify your diagrams.
程序员一时兴起以一种武断的方式来采用树形视图表现随意的对象，在可用性方面会遇到很大的问题。
Using a treeview to represent arbitrary objects organized in an arbitrary fashion at the whim of a programmer is asking for big trouble when it comes to usability.
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