In this diagram I simplified some less related entities but still we can see tree-style structure which shows the leveled relationship among the key research objects.
在图中省略了一些关系强度更弱的要素，但是我们任然可以看出整个关系网大致呈现倒立的树状结构。
This code fragment is represented on the decorated style sheet tree by the structure shown in Figure 2.
在装饰树上，由图2中显示的结构表示这段代码。
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