Inheritance allows you to reuse code across different types of classes.
继承机制允许你去重用其他类的代码。
The complete set of class loaders make up a tree-structured hierarchy with different types of classes loaded at each level.
整个类装入器集合形成了树状结构的层次结构，在其每个层次上都可装入不同类型的类。
In terms of class, digital divide exists among different types of workers and between the upper and middle classes and the lower class.
在阶级方面，不同类型的工作者，以及中上层阶级和下层阶级之间，都存在着数字鸿沟。
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