The near empty class root is really a placeholder for the root URL of your site.

root 基本上是一个空类，实际上是站点根 URL 的占位符。

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Some nodes do not show the class name because those instances do not contribute significantly to the size of the root class instance.

某些节点并未显示类名，这是由于这些实例对根类实例的大小无显著影响。

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Listing 1 gives the code for the root class of this data structure.

清单1给出了这个数据结构根类的代码。

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More importantly, continued policy focus on income redistribution perpetuates the idea that income inequality is the root of middle class economic problems, rather than the effect, allowing for the continued avoidance of the deep-rooted structural issues in the U.S. economy.

FORBES: How Will The Middle Class Fare In The Battle Over The Fiscal Cliff?

With its stunning Renaissance art and architecture on view in well-proportioned squares and in world-class museums, there is a sense of elegance and permanence that helps root all who live here.

BBC: Living in: Florence