SWT提供了更高级组件的本机版本，如树、工具栏和表。
SWT provides a native version of the more advanced components, such as trees, toolbars, and tables.
中间树：XSLT的第一个版本只能对输入的xml树进行操作。
Temporary trees: in the first version of XSLT, you had to operate on the input XML tree.
将重新构建较新版本的源代码树。
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