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相比于使用盘符的文件系统，盘符将文件系统划分成一系列不同的树(一个盘符代表一个文件目录树)，而Linux系统只有一个文件目录树(并没有分割文件系统)。
While drive letters split the file system into a series of different trees (one for each drive), Linux always has a single tree.
图2是演示应用程序的另一个面板，它包含更复杂的组件类型，如分割窗格、树和显示HTML内容的编辑器窗格。
Figure 2 is another panel of the demonstration application, containing more complex component types such as split panes, trees, and an editor pane showing HTML content.
如果重新分配的块小于原来的块，那么把它分割开，多余的块返回给空闲树，请求的块返回给调用者。
If the size of the reallocated block is smaller than the original block, the block is split and the extra block is returned to the free tree with the required size block being returned to the caller.
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