所以，造型就是沿着继承图朝着基类向上：向上造型。

Thus, casting to a base type is moving up the inheritance diagram: upcasting.

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凭借继承图，开发者能快速访问到类型的整个继承关系。

The ancestry diagram allows the developer to quickly access the hierarchy of a type.

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因此，我们可以在单元级别定义这些变量，这样，单元中的每个框都将继承这些定义(图31)。

Therefore, we can define those variables at the cell level, so that every box in the cell will inherit those definitions (Figure 31).

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