在图1.8中，通过增加类型标识符，我们让任务更加特殊。
In figure 1.8 we made the tasks more specific by adding a type identifier.
使用load方法并传递需要加载的类类型以及记录的标识符值。
You use the load method and pass it the class type you want to load, as well as the identity value for the entry you want.
变量是保存任何数据类型的值的标识符。
Variables are identifiers that hold values of any data type.
变量是保存任何数据类型的值的标识符。
Variables are identifiers that hold values of any data type.
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