考虑一个简化版的小型树结构，如图8所示。
Let's consider a simplified version of the small tree structure from Figure 8.
在他于1994年出版的《结构性低迷》一书中，他雄心勃勃的试图给出一个自然率失业演化的一般理论。
His book "Structural Slumps", published in 1994, is an ambitious attempt to provide a general theory of how the natural rate of unemployment evolves.
微格式是 XHTML 中另一版本的结构化数据，它由一群草根开发人员在一年多后推出。
Microformats, another version of structured data in XHTML, was launched a little more than a year later by a grassroots group of developers.
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