Even with lots of data, mapping the structure of a language is incredibly complex.

即使有大量数据，映射一种语言的结构也非常复杂。

In four years,they organized 20,000 residents to collect data, map structures and put it together.

四年间，他们组织了20, 000名居民收集数据，绘制结构图并将其组合在一起。