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```
Map的value类型也可以是一个聚合类型，比如是一个map或slice。在下面的代码中，图graph的key类型是一个字符串，value类型map[string]bool代表一个字符串集合。从概念上讲，graph将一个字符串类型的key映射到一组相关的字符串集合，它们指向新的graph的key。
Map的value类型也可以是一个聚合类型，比如是一个map或slice。在下面的代码中，graph 这个 map 的key类型是一个字符串，value类型map[string]bool代表一个字符串集合。从概念上讲，graph将一个字符串类型的key映射到一组相关的字符串集合，它们指向新的graph的key。
<u><i>gopl.io/ch4/graph</i></u>
```Go