下一步是让类变得稍微动态一些：动态地为每个字段创建get _和set _方法。
The next step is to make the class a bit dynamic by creating the get_ and set_ methods on the fly for the individual fields.
下一步是让类变得稍微动态一些：动态地为每个字段创建get _和set _方法。
The next step is to make the class a bit dynamic by creating the get_ and set_ methods on the fly for the individual fields.
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