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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In this case, a root class (upper-left corner in red) is where the problem originated.

在本例中，一个根类(左上角用红色标明的那个类)是问题的发源地。

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A class hierarchy always has a root class; this is a class with very general behavior.

类层次结构总会有一个根类(root class)，这是一个具有普遍行为的类。

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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