Solution 3: Create a pattern, and combine it with the original enumerated type.

解决方案3：创建一个模式，并与原始枚举类型结合。

youdao

If you want to use the same semantic element to contain both base enumerations and extended enumerations, consider solution 3 (union with a pattern).

如果想使用相同的语义元素来包含基本枚举列表和扩展枚举列表，可以考虑解决方案3(与模式联合)。

youdao

youdao

What I though I'd do is just tease you with some visuals if you haven't gotten to the point of playing with the staff solution so the themes of problem set 3 are two-fold.

如果你们还没达到使用解决方案的程度,那现在我能做的就是用一些图形为你们梳理一下,习题集3的主题,是两方面的。

哈佛公开课 - 计算机科学课程节选

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