这是Scala中的一个常见的特色，它可以提供更简单、更类型安全的枚举方式。

This is a common idiom in Scala to provide a simpler, more type-safe way of doing enumerations.

youdao

地图和枚举是完全不同的数据结构。地图是将值与关键。为使类型安全的枚举常数。比较是不可能的！

Maps and enums are completely different data structures. Maps are for associating a value with a key. Enums are for make typesafe constants. Comparing the two is impossible!

youdao

地图和枚举是完全不同的数据结构。地图是将值与关键。为使类型安全的枚举常数。比较是不可能的！

Maps and enums are completely different data structures. Maps are for associating a value with a key. Enums are for make typesafe constants. Comparing the two is impossible!

youdao