The views should be declared based on class name, so an object of class "a: : Beta" could have a different dynamic view from "a: : Gamma" without any extra work on the programmer's part.
视图的声明应该基于类名，所以类“A：Beta”的一个对象可以有与“A：Gamma”不同的动态视图，而不需要程序员付出额外的工作。
Middle-class families do not take their children out of school to work in the fields or in a sweatshop because they do not need the tiny extra income a child’s labour brings in.
中产阶级的家庭不会让孩子辍学去到农田里干活或到血汗工作打工，因为他们不需要孩子挣的那点额外收入。
My "enrichment1" class at school taught me how to do homework and review for tests, and my teachers gave me extra time to do class work.
在学校里我的“补习课”教我如何做作业，如何进行复习以对付考试。我的老师给了我额外的时间做课堂作业。
My "enrichment1" class at school taught me how to do homework and review for tests, and my teachers gave me extra time to do class work.
在学校里我的“补习课”教我如何做作业，如何进行复习以对付考试。我的老师给了我额外的时间做课堂作业。
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