• 1. extra-class work: 课外作业
• 2. do extra work in class: 在班内做额外的工作
• 3. do extra work after class: 在课后做额外工作

• 1.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。
  dict.yoduao.com
• 2.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。
  dict.yoduao.com
• 3.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。
  dict.yoduao.com

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