Thus, the Human Resources class depends on a specific implementation of a customer class.
所以,Human resources类要依赖于客户类的特定实现。
Once the above line is present, all the resources are handled by your custom resources class.
实现以上行之后,所有的资源将被自定义资源类处理。
When you write the Human Resources class, you don't know which type of customer you'll process for a given employee.
在编写Human resources类时,不知道给定员工要处理哪种类型的客户。
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