However, instantiating this map for every token type, and perhaps within each translation unit (for some popular template instantiation strategies) increase compile time overhead and space overhead.

• 然而，为每个标记类型实例化该映射，并且可能在每个翻译单元中都要实例化（因为某些流行的模板实例化策略），增加了编译的时间开销和空间开销。