SWT, the widget library, is one of these.
部件库 SWT 就是其中之一。
For example, if you're using a widget library, you might adapt the model to fit nicely with the widgets.
比如，如果使用了一个小部件(widget)库，那么可能需要调整模型，以适应这些部件。
Dojo's dijit library contains a tree widget with basic tree functionality.
Dojo的dijit库包含一个具备基础树功能的Tree小部件。
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